Ubuntu Manpage: tnftp — Internet file transfer program

Provided by: tnftp_20230507-2build3_amd64

NAME

     tnftp — Internet file transfer program

SYNOPSIS

     tnftp [-46AadefginpRtVv?] [-N netrc] [-o output] [-P port] [-q quittime] [-r retry]
           [-s srcaddr] [-T dir,max[,inc]] [-x xfersize] [[user@]host [port]]
           [[user@]host:[path][/]] [file:///path]
           [ftp://[user[:password]@]host[:port]/path[/][;type=type]]
           [http://[user[:password]@]host[:port]/path]
           [https://[user[:password]@]host[:port]/path] ...
     tnftp -u url file ...

DESCRIPTION

tnftp is the user interface to the Internet standard File Transfer Protocol. The program
allows a user to transfer files to and from a remote network site.

The last five arguments will fetch a file using the FTP or HTTP protocols, or by direct
copying, into the current directory. This is ideal for scripts. Refer to AUTO-FETCHING
FILES below for more information.

Options may be specified at the command line, or to the command interpreter.

-4 Forces tnftp to only use IPv4 addresses.

-6 Forces tnftp to only use IPv6 addresses.

-A Force active mode FTP. By default, tnftp will try to use passive mode FTP and
fall back to active mode if passive is not supported by the server. This option
causes tnftp to always use an active connection. It is only useful for
connecting to very old servers that do not implement passive mode properly.

-a Causes tnftp to bypass normal login procedure, and use an anonymous login
instead.

-d Enables debugging.

-e Disables command line editing. This is useful for Emacs ange-ftp mode.

-f Forces a cache reload for transfers that go through the FTP or HTTP proxies.

-g Disables file name globbing.

-i Turns off interactive prompting during multiple file transfers.

-N netrc Use netrc instead of ~/.netrc. Refer to THE .netrc FILE for more information.

-n Restrains tnftp from attempting “auto-login” upon initial connection for non
auto-fetch transfers. If auto-login is enabled, tnftp will check the .netrc
(see below) file in the user's home directory for an entry describing an account
on the remote machine. If no entry exists, tnftp will prompt for the remote
machine login name (default is the user identity on the local machine), and, if
necessary, prompt for a password and an account with which to login. To
override the auto-login for auto-fetch transfers, specify the username (and
optionally, password) as appropriate.

-o output When auto-fetching files, save the contents in output. output is parsed
according to the FILE NAMING CONVENTIONS below. If output is not ‘-’ or doesn't
start with ‘|’, then only the first file specified will be retrieved into
output; all other files will be retrieved into the basename of their remote
name.

-P port Sets the port number to port.

-p Enable passive mode operation for use behind connection filtering firewalls.
This option has been deprecated as tnftp now tries to use passive mode by
default, falling back to active mode if the server does not support passive
connections.

-q quittime
Quit if the connection has stalled for quittime seconds.

-R Restart all non-proxied auto-fetches.

-r wait Retry the connection attempt if it failed, pausing for wait seconds.

-s srcaddr Uses srcaddr as the local IP address for all connections.

-t Enables packet tracing.

-T direction,maximum[,increment]
Set the maximum transfer rate for direction to maximum bytes/second, and if
specified, the increment to increment bytes/second. Refer to rate for more
information.

-u url file ...
Upload files on the command line to url where url is one of the ‘ftp://’ URL
types as supported by auto-fetch (with an optional target filename for single
file uploads), and file is one or more local files to be uploaded.

-V Disable verbose and progress, overriding the default of enabled when output is
to a terminal.

-v Enable verbose and progress. This is the default if output is to a terminal
(and in the case of progress, tnftp is the foreground process). Forces tnftp to
show all responses from the remote server, as well as report on data transfer
statistics.

-x xfersize
Set the size of the socket send and receive buffers to xfersize. Refer to
xferbuf for more information.

-? Display help to stdout, and exit.

The client host with which tnftp is to communicate may be specified on the command line. If
this is done, tnftp will immediately attempt to establish a connection to an FTP server on
that host; otherwise, tnftp will enter its command interpreter and await instructions from
the user. When tnftp is awaiting commands from the user the prompt ‘ftp>’ is provided to
the user. The following commands are recognized by tnftp:

! [command [args]]
Invoke an interactive shell on the local machine. If there are arguments, the
first is taken to be a command to execute directly, with the rest of the
arguments as its arguments.

$ macro-name [args]
Execute the macro macro-name that was defined with the macdef command.
Arguments are passed to the macro unglobbed.

account [passwd]
Supply a supplemental password required by a remote system for access to
resources once a login has been successfully completed. If no argument is
included, the user will be prompted for an account password in a non-echoing
input mode.

append local-file [remote-file]
Append a local file to a file on the remote machine. If remote-file is left
unspecified, the local file name is used in naming the remote file after being
altered by any ntrans or nmap setting. File transfer uses the current settings
for type, format, mode, and structure.

ascii Set the file transfer type to network ASCII. This is the default type.

bell Arrange that a bell be sounded after each file transfer command is completed.

binary Set the file transfer type to support binary image transfer.

bye Terminate the FTP session with the remote server and exit tnftp. An end of file
will also terminate the session and exit.

case Toggle remote computer file name case mapping during get, mget and mput
commands. When case is on (default is off), remote computer file names with all
letters in upper case are written in the local directory with the letters mapped
to lower case.

cd remote-directory
Change the working directory on the remote machine to remote-directory.

cdup Change the remote machine working directory to the parent of the current remote
machine working directory.

chmod mode remote-file
Change the permission modes of the file remote-file on the remote system to
mode.

close Terminate the FTP session with the remote server, and return to the command
interpreter. Any defined macros are erased.

cr Toggle carriage return stripping during ascii type file retrieval. Records are
denoted by a carriage return/linefeed sequence during ascii type file transfer.
When cr is on (the default), carriage returns are stripped from this sequence to
conform with the UNIX single linefeed record delimiter. Records on non-UNIX
remote systems may contain single linefeeds; when an ascii type transfer is
made, these linefeeds may be distinguished from a record delimiter only when cr
is off.

debug [debug-value]
Toggle debugging mode. If an optional debug-value is specified it is used to
set the debugging level. When debugging is on, tnftp prints each command sent
to the remote machine, preceded by the string ‘-->’.

delete remote-file
Delete the file remote-file on the remote machine.

dir [remote-path [local-file]]
Print a listing of the contents of a directory on the remote machine. The
listing includes any system-dependent information that the server chooses to
include; for example, most UNIX systems will produce output from the command ‘ls
-l’. If remote-path is left unspecified, the current working directory is used.
If interactive prompting is on, tnftp will prompt the user to verify that the
last argument is indeed the target local file for receiving dir output. If no
local file is specified, or if local-file is ‘-’, the output is sent to the
terminal.

disconnect A synonym for close.

edit Toggle command line editing, and context sensitive command and file completion.
This is automatically enabled if input is from a terminal, and disabled
otherwise.

epsv, epsv4, epsv6
Toggle the use of the extended EPSV and EPRT commands on all IP, IPv4, and IPv6
connections respectively. First try EPSV/EPRT, and then PASV/PORT. This is
enabled by default. If an extended command fails then this option will be
temporarily disabled for the duration of the current connection, or until epsv,
epsv4, or epsv6 is executed again.

exit A synonym for bye.

features Display what features the remote server supports (using the FEAT command).

fget localfile
Retrieve the files listed in localfile, which has one line per filename.

form format
Set the file transfer form to format. The default (and only supported) format
is ‘non-print’.

ftp host [port]
A synonym for open.

gate [host [port]]
Toggle gate-ftp mode, which used to connect through the TIS FWTK and Gauntlet
FTP proxies. This will not be permitted if the gate-ftp server hasn't been set
(either explicitly by the user, or from the FTPSERVER environment variable). If
host is given, then gate-ftp mode will be enabled, and the gate-ftp server will
be set to host. If port is also given, that will be used as the port to connect
to on the gate-ftp server.

get remote-file [local-file]
Retrieve the remote-file and store it on the local machine. If the local file
name is not specified, it is given the same name it has on the remote machine,
subject to alteration by the current case, ntrans, and nmap settings. The
current settings for type, form, mode, and structure are used while transferring
the file.

glob Toggle filename expansion for mdelete, mget, mput, and mreget. If globbing is
turned off with glob, the file name arguments are taken literally and not
expanded. Globbing for mput is done as in csh(1). For mdelete, mget, and
mreget, each remote file name is expanded separately on the remote machine and
the lists are not merged. Expansion of a directory name is likely to be
different from expansion of the name of an ordinary file: the exact result
depends on the foreign operating system and FTP server, and can be previewed by
doing ‘mls remote-files -’. Note: mget, mput and mreget are not meant to
transfer entire directory subtrees of files. That can be done by transferring a
tar(1) archive of the subtree (in binary mode).

hash [size]
Toggle hash-sign (‘#’) printing for each data block transferred. The size of a
data block defaults to 1024 bytes. This can be changed by specifying size in
bytes. Enabling hash disables progress.

help [command]
Print an informative message about the meaning of command. If no argument is
given, tnftp prints a list of the known commands.

idle [seconds]
Set the inactivity timer on the remote server to seconds seconds. If seconds is
omitted, the current inactivity timer is printed.

image A synonym for binary.

lcd [directory]
Change the working directory on the local machine. If no directory is
specified, the user's home directory is used.

less file A synonym for page.

lpage local-file
Display local-file with the program specified by the set pager option.

lpwd Print the working directory on the local machine.

ls [remote-path [local-file]]
A synonym for dir.

macdef macro-name
Define a macro. Subsequent lines are stored as the macro macro-name; a null
line (consecutive newline characters in a file or carriage returns from the
terminal) terminates macro input mode. There is a limit of 16 macros and 4096
total characters in all defined macros. Macro names can be a maximum of 8
characters. Macros are only applicable to the current session they are defined
within (or if defined outside a session, to the session invoked with the next
open command), and remain defined until a close command is executed. To invoke
a macro, use the $ command (see above).

The macro processor interprets ‘$’ and ‘\’ as special characters. A ‘$’
followed by a number (or numbers) is replaced by the corresponding argument on
the macro invocation command line. A ‘$’ followed by an ‘i’ signals the macro
processor that the executing macro is to be looped. On the first pass ‘$i’ is
replaced by the first argument on the macro invocation command line, on the
second pass it is replaced by the second argument, and so on. A ‘\’ followed by
any character is replaced by that character. Use the ‘\’ to prevent special
treatment of the ‘$’.

mdelete [remote-files]
Delete the remote-files on the remote machine.

mdir remote-files local-file
Like dir, except multiple remote files may be specified. If interactive
prompting is on, tnftp will prompt the user to verify that the last argument is
indeed the target local file for receiving mdir output.

mget remote-files
Expand the remote-files on the remote machine and do a get for each file name
thus produced. See glob for details on the filename expansion. Resulting file
names will then be processed according to case, ntrans, and nmap settings.
Files are transferred into the local working directory, which can be changed
with lcd directory; new local directories can be created with ! mkdir directory.

mkdir directory-name
Make a directory on the remote machine.

mls remote-files local-file
Like ls, except multiple remote files may be specified, and the local-file must
be specified. If interactive prompting is on, tnftp will prompt the user to
verify that the last argument is indeed the target local file for receiving mls
output.

mlsd [remote-path]
Display the contents of remote-path (which should default to the current
directory if not given) in a machine-parsable form, using MLSD. The format of
display can be changed with ‘remopts mlst ...’.

mlst [remote-path]
Display the details about remote-path (which should default to the current
directory if not given) in a machine-parsable form, using MLST. The format of
display can be changed with ‘remopts mlst ...’.

mode mode-name
Set the file transfer mode to mode-name. The default (and only supported) mode
is ‘stream’.

modtime remote-file
Show the last modification time of the file on the remote machine, in RFC 2822
format.

more file A synonym for page.

mput local-files
Expand wild cards in the list of local files given as arguments and do a put for
each file in the resulting list. See glob for details of filename expansion.
Resulting file names will then be processed according to ntrans and nmap
settings.

mreget remote-files
As per mget, but performs a reget instead of get.

msend local-files
A synonym for mput.

newer remote-file [local-file]
Get the file only if the modification time of the remote file is more recent
that the file on the current system. If the file does not exist on the current
system, the remote file is considered newer. Otherwise, this command is
identical to get.

nlist [remote-path [local-file]]
A synonym for ls.

nmap [inpattern outpattern]
Set or unset the filename mapping mechanism. If no arguments are specified, the
filename mapping mechanism is unset. If arguments are specified, remote
filenames are mapped during mput commands and put commands issued without a
specified remote target filename. If arguments are specified, local filenames
are mapped during mget commands and get commands issued without a specified
local target filename. This command is useful when connecting to a non-UNIX
remote computer with different file naming conventions or practices. The
mapping follows the pattern set by inpattern and outpattern.

inpattern is a template for incoming filenames (which may have already been
processed according to the ntrans and case settings). Variable templating is
accomplished by including the sequences ‘$1’, ‘$2’, ..., ‘$9’ in inpattern. Use
‘\’ to prevent this special treatment of the ‘$’ character. All other
characters are treated literally, and are used to determine the nmap [inpattern]
variable values. For example, given inpattern ‘$1.$2’ and the remote file name
‘mydata.data’, ‘$1’ would have the value ‘mydata’, and ‘$2’ would have the value
‘data’.

The outpattern determines the resulting mapped filename. The sequences ‘$1’,
‘$2’, ..., ‘$9’ are replaced by any value resulting from the inpattern template.
The sequence ‘$0’ is replaced by the original filename. Additionally, the
sequence [seq1,seq2] is replaced by seq1 if seq1 is not a null string; otherwise
it is replaced by seq2. For example, the command

nmap $1.$2.$3 [$1,$2].[$2,file]

would yield the output filename ‘myfile.data’ for input filenames ‘myfile.data’
and ‘myfile.data.old’, ‘myfile.file’ for the input filename ‘myfile’, and
‘myfile.myfile’ for the input filename ‘.myfile’. Spaces may be included in
outpattern, as in the example:

nmap $1 sed s/ *$// > $1

Use the ‘\’ character to prevent special treatment of the ‘$’, ‘[’, ‘]’, and ‘,’
characters.

ntrans [inchars [outchars]]
Set or unset the filename character translation mechanism. If no arguments are
specified, the filename character translation mechanism is unset. If arguments
are specified, characters in remote filenames are translated during mput
commands and put commands issued without a specified remote target filename. If
arguments are specified, characters in local filenames are translated during
mget commands and get commands issued without a specified local target filename.
This command is useful when connecting to a non-UNIX remote computer with
different file naming conventions or practices. Characters in a filename
matching a character in inchars are replaced with the corresponding character in
outchars. If the character's position in inchars is longer than the length of
outchars, the character is deleted from the file name.

open host [port]
Establish a connection to the specified host FTP server. An optional port
number may be supplied, in which case, tnftp will attempt to contact an FTP
server at that port. If the set auto-login option is on (default), tnftp will
also attempt to automatically log the user in to the FTP server (see below).

page file Retrieve file and display with the program specified by the set pager option.

passive [auto]
Toggle passive mode (if no arguments are given). If auto is given, act as if
FTPMODE is set to ‘auto’. If passive mode is turned on (default), tnftp will
send a PASV command for all data connections instead of a PORT command. The
PASV command requests that the remote server open a port for the data connection
and return the address of that port. The remote server listens on that port and
the client connects to it. When using the more traditional PORT command, the
client listens on a port and sends that address to the remote server, who
connects back to it. Passive mode is useful when using tnftp through a gateway
router or host that controls the directionality of traffic. (Note that though
FTP servers are required to support the PASV command by RFC 1123, some do not.)

pdir [remote-path]
Perform dir [remote-path], and display the result with the program specified by
the set pager option.

pls [remote-path]
Perform ls [remote-path], and display the result with the program specified by
the set pager option.

pmlsd [remote-path]
Perform mlsd [remote-path], and display the result with the program specified by
the set pager option.

preserve Toggle preservation of modification times on retrieved files.

progress Toggle display of transfer progress bar. The progress bar will be disabled for
a transfer that has local-file as ‘-’ or a command that starts with ‘|’. Refer
to FILE NAMING CONVENTIONS for more information. Enabling progress disables
hash.

prompt Toggle interactive prompting. Interactive prompting occurs during multiple file
transfers to allow the user to selectively retrieve or store files. If
prompting is turned off (default is on), any mget or mput will transfer all
files, and any mdelete will delete all files.

When prompting is on, the following commands are available at a prompt:

a Answer ‘yes’ to the current file, and automatically answer ‘yes’ to
any remaining files for the current command.

n Answer ‘no’, and do not transfer the file.

p Answer ‘yes’ to the current file, and turn off prompt mode (as if
prompt off had been given).

q Terminate the current operation.

y Answer ‘yes’, and transfer the file.

? Display a help message.

Any other response will answer ‘yes’ to the current file.

proxy ftp-command
Execute an FTP command on a secondary control connection. This command allows
simultaneous connection to two remote FTP servers for transferring files between
the two servers. The first proxy command should be an open, to establish the
secondary control connection. Enter the command ‘proxy ?’ to see other FTP
commands executable on the secondary connection. The following commands behave
differently when prefaced by proxy: open will not define new macros during the
auto-login process, close will not erase existing macro definitions, get and
mget transfer files from the host on the primary control connection to the host
on the secondary control connection, and put, mput, and append transfer files
from the host on the secondary control connection to the host on the primary
control connection. Third party file transfers depend upon support of the FTP
protocol PASV command by the server on the secondary control connection.

put local-file [remote-file]
Store a local file on the remote machine. If remote-file is left unspecified,
the local file name is used after processing according to any ntrans or nmap
settings in naming the remote file. File transfer uses the current settings for
type, format, mode, and structure.

pwd Print the name of the current working directory on the remote machine.

quit A synonym for bye.

quote [arg ...]
The arguments specified are sent, verbatim, to the remote FTP server.

rate direction [maximum [increment]]
Throttle the maximum transfer rate to maximum bytes/second. If maximum is 0,
disable the throttle.

direction may be one of:
all Both directions.
get Incoming transfers.
put Outgoing transfers.

maximum can be modified on the fly by increment bytes (default: 1024) each time
a given signal is received:

SIGUSR1 Increment maximum by increment bytes.

SIGUSR2 Decrement maximum by increment bytes. The result must be a
positive number.

If maximum is not supplied, the current throttle rates are displayed.

Note: rate is not yet implemented for ascii mode transfers.

rcvbuf size
Set the size of the socket receive buffer to size.

recv remote-file [local-file]
A synonym for get.

reget remote-file [local-file]
reget acts like get, except that if local-file exists and is smaller than
remote-file, local-file is presumed to be a partially transferred copy of
remote-file and the transfer is continued from the apparent point of failure.
This command is useful when transferring very large files over networks that are
prone to dropping connections.

remopts command [command-options]
Set options on the remote FTP server for command to command-options (whose
absence is handled on a command-specific basis). Remote FTP commands known to
support options include: MLST (used for MLSD and MLST).

rename [from [to]]
Rename the file from on the remote machine, to the file to.

reset Clear reply queue. This command re-synchronizes command/reply sequencing with
the remote FTP server. Resynchronization may be necessary following a violation
of the FTP protocol by the remote server.

restart marker
Restart the immediately following get or put at the indicated marker. On UNIX
systems, marker is usually a byte offset into the file.

rhelp [command-name]
Request help from the remote FTP server. If a command-name is specified it is
supplied to the server as well.

rmdir directory-name
Delete a directory on the remote machine.

rstatus [remote-file]
With no arguments, show status of remote machine. If remote-file is specified,
show status of remote-file on remote machine.

runique Toggle storing of files on the local system with unique filenames. If a file
already exists with a name equal to the target local filename for a get or mget
command, a ‘.1’ is appended to the name. If the resulting name matches another
existing file, a ‘.2’ is appended to the original name. If this process
continues up to ‘.99’, an error message is printed, and the transfer does not
take place. The generated unique filename will be reported. Note that runique
will not affect local files generated from a shell command (see below). The
default value is off.

send local-file [remote-file]
A synonym for put.

sendport Toggle the use of PORT commands. By default, tnftp will attempt to use a PORT
command when establishing a connection for each data transfer. The use of PORT
commands can prevent delays when performing multiple file transfers. If the
PORT command fails, tnftp will use the default data port. When the use of PORT
commands is disabled, no attempt will be made to use PORT commands for each data
transfer. This is useful for certain FTP implementations which do ignore PORT
commands but, incorrectly, indicate they've been accepted.

set [option value]
Set option to value. If option and value are not given, display all of the
options and their values. The currently supported options are:

anonpass Defaults to $FTPANONPASS

ftp_proxy Defaults to $ftp_proxy.

http_proxy Defaults to $http_proxy.

https_proxy Defaults to $https_proxy.

no_proxy Defaults to $no_proxy.

pager Defaults to $PAGER.

prompt Defaults to $FTPPROMPT.

rprompt Defaults to $FTPRPROMPT.

sslnoverify Defaults to $FTPSSLNOVERIFY.

site [arg ...]
The arguments specified are sent, verbatim, to the remote FTP server as a SITE
command.

size remote-file
Return size of remote-file on remote machine.

sndbuf size
Set the size of the socket send buffer to size.

status Show the current status of tnftp.

struct struct-name
Set the file transfer structure to struct-name. The default (and only
supported) structure is ‘file’.

sunique Toggle storing of files on remote machine under unique file names. The remote
FTP server must support FTP protocol STOU command for successful completion.
The remote server will report unique name. Default value is off.

system Show the type of operating system running on the remote machine.

tenex Set the file transfer type to that needed to talk to TENEX machines.

throttle A synonym for rate.

trace Toggle packet tracing.

type [type-name]
Set the file transfer type to type-name. If no type is specified, the current
type is printed. The default type is network ASCII.

umask [newmask]
Set the default umask on the remote server to newmask. If newmask is omitted,
the current umask is printed.

unset option
Unset option. Refer to set for more information.

usage command
Print the usage message for command.

user user-name [password [account]]
Identify yourself to the remote FTP server. If the password is not specified
and the server requires it, tnftp will prompt the user for it (after disabling
local echo). If an account field is not specified, and the FTP server requires
it, the user will be prompted for it. If an account field is specified, an
account command will be relayed to the remote server after the login sequence is
completed if the remote server did not require it for logging in. Unless tnftp
is invoked with “auto-login” disabled, this process is done automatically on
initial connection to the FTP server.

verbose Toggle verbose mode. In verbose mode, all responses from the FTP server are
displayed to the user. In addition, if verbose is on, when a file transfer
completes, statistics regarding the efficiency of the transfer are reported. By
default, verbose is on.

xferbuf size
Set the size of the socket send and receive buffers to size.

? [command]
A synonym for help.

Command arguments which have embedded spaces may be quoted with quote ‘"’ marks.

Commands which toggle settings can take an explicit on or off argument to force the setting
appropriately.

Commands which take a byte count as an argument (e.g., hash, rate, and xferbuf) support an
optional suffix on the argument which changes the interpretation of the argument. Supported
suffixes are:
b Causes no modification. (Optional)
k Kilo; multiply the argument by 1024
m Mega; multiply the argument by 1048576
g Giga; multiply the argument by 1073741824

If tnftp receives a SIGINFO (see the status argument of stty(1)) or SIGQUIT signal whilst a
transfer is in progress, the current transfer rate statistics will be written to the
standard error output, in the same format as the standard completion message.

AUTO-FETCHING FILES

In addition to standard commands, this version of tnftp supports an auto-fetch feature. To
enable auto-fetch, simply pass the list of hostnames/files on the command line.

The following formats are valid syntax for an auto-fetch element:

[user@]host:[path][/]
“Classic” FTP format.

If path contains a glob character and globbing is enabled, (see glob), then the
equivalent of mget path is performed.

If the directory component of path contains no globbing characters, it is stored
locally with the name basename (see basename(1)) of path, in the current directory.
Otherwise, the full remote name is used as the local name, relative to the local root
directory.

ftp://[user[:password]@]host[:port]/path[/][;type=type]
An FTP URL, retrieved using the FTP protocol if set ftp_proxy isn't defined.
Otherwise, transfer the URL using HTTP via the proxy defined in set ftp_proxy. If set
ftp_proxy isn't defined and user is given, login as user. In this case, use password
if supplied, otherwise prompt the user for one.

If a suffix of ‘;type=A’ or ‘;type=I’ is supplied, then the transfer type will take
place as ascii or binary (respectively). The default transfer type is binary.

In order to be compliant with RFC 3986, tnftp interprets the path part of an ‘ftp://’
auto-fetch URL as follows:

• The ‘/’ immediately after the host[:port] is interpreted as a separator before the
path, and not as part of the path itself.

• The path is interpreted as a ‘/’-separated list of name components. For all but
the last such component, tnftp performs the equivalent of a cd command. For the
last path component, tnftp performs the equivalent of a get command.

• Empty name components, which result from ‘//’ within the path, or from an extra
‘/’ at the beginning of the path, will cause the equivalent of a cd command
without a directory name. This is unlikely to be useful.

• Any ‘%XX’ codes (per RFC 3986) within the path components are decoded, with XX
representing a character code in hexadecimal. This decoding takes place after the
path has been split into components, but before each component is used in the
equivalent of a cd or get command. Some often-used codes are ‘%2F’ (which
represents ‘/’) and ‘%7E’ (which represents ‘~’).

The above interpretation has the following consequences:

• The path is interpreted relative to the default login directory of the specified
user or of the ‘anonymous’ user. If the / directory is required, use a leading
path of ‘%2F’. If a user's home directory is required (and the remote server
supports the syntax), use a leading path of ‘%7Euser/’. For example, to retrieve
/etc/motd from ‘localhost’ as the user ‘myname’ with the password ‘mypass’, use
‘ftp://myname:mypass@localhost/%2fetc/motd’

• The exact cd and get commands can be controlled by careful choice of where to use
‘/’ and where to use ‘%2F’ (or ‘%2f’). For example, the following URLs correspond
to the equivalents of the indicated commands:

ftp://host/dir1/dir2/file cd dir1, cd dir2, get file.

ftp://host/%2Fdir1/dir2/file cd /dir1, cd dir2, get file.

ftp://host/dir1%2Fdir2/file cd dir1/dir2, get file.

• You must have appropriate access permission for each of the intermediate
directories that is used in the equivalent of a cd command.

http://[user[:password]@]host[:port]/path
An HTTP URL, retrieved using the HTTP protocol. If set http_proxy is defined, it is
used as a URL to an HTTP proxy server. If HTTP authorization is required to retrieve
path, and user (and optionally password) is in the URL, use them for the first attempt
to authenticate.

https://[user[:password]@]host[:port]/path
An HTTPS URL, retrieved using the HTTPS protocol. If set https_proxy is defined, it
is used as a URL to an HTTPS proxy server. If HTTPS authorization is required to
retrieve path, and user (and optionally password) is in the URL, use them for the
first attempt to authenticate. There is currently no certificate validation and
verification.

file:///path
A local URL, copied from /path on the local host.

about:topic
Display information regarding topic; no file is retrieved for this auto-fetched
element. Supported values include:

about:ftp Information about tnftp.

about:version The version of tnftp. Useful to provide when reporting problems.

Unless noted otherwise above, and -o output is not given, the file is stored in the current
directory as the basename(1) of path. Note that if a HTTP redirect is received, the fetch
is retried using the new target URL supplied by the server, with a corresponding new path.
Using an explicit -o output is recommended, to avoid writing to unexpected file names.

If a classic format or an FTP URL format has a trailing ‘/’ or an empty path component, then
tnftp will connect to the site and cd to the directory given as the path, and leave the user
in interactive mode ready for further input. This will not work if set ftp_proxy is being
used.

Direct HTTP transfers use HTTP 1.1. Proxied FTP and HTTP transfers use HTTP 1.0.

If -R is given, all auto-fetches that don't go via the FTP or HTTP proxies will be
restarted. For FTP, this is implemented by using reget instead of get. For HTTP, this is
implemented by using the ‘Range: bytes=’ HTTP/1.1 directive.

If WWW or proxy WWW authentication is required, you will be prompted to enter a username and
password to authenticate with.

When specifying IPv6 numeric addresses in a URL, you need to surround the address in square
brackets. E.g.: ‘ftp://[::1]:21/’. This is because colons are used in IPv6 numeric address
as well as being the separator for the port number.

ABORTING A FILE TRANSFER

     To abort a file transfer, use the terminal interrupt key (usually Ctrl-C).  Sending
     transfers will be immediately halted.  Receiving transfers will be halted by sending an FTP
     protocol ABOR command to the remote server, and discarding any further data received.  The
     speed at which this is accomplished depends upon the remote server's support for ABOR
     processing.  If the remote server does not support the ABOR command, the prompt will not
     appear until the remote server has completed sending the requested file.

     If the terminal interrupt key sequence is used whilst tnftp is awaiting a reply from the
     remote server for the ABOR processing, then the connection will be closed.  This is
     different from the traditional behaviour (which ignores the terminal interrupt during this
     phase), but is considered more useful.

FILE NAMING CONVENTIONS

Files specified as arguments to tnftp commands are processed according to the following
rules.

1. If the file name ‘-’ is specified, the stdin (for reading) or stdout (for writing) is
used.

2. If the first character of the file name is ‘|’, the remainder of the argument is
interpreted as a shell command. tnftp then forks a shell, using popen(3) with the
argument supplied, and reads (writes) from the stdout (stdin). If the shell command
includes spaces, the argument must be quoted; e.g. ‘"| ls -lt"’. A particularly
useful example of this mechanism is: ‘dir "" |more’.

3. Failing the above checks, if globbing is enabled, local file names are expanded
according to the rules used in the csh(1); see the glob command. If the tnftp command
expects a single local file (e.g. put), only the first filename generated by the
globbing operation is used.

4. For mget commands and get commands with unspecified local file names, the local
filename is the remote filename, which may be altered by a case, ntrans, or nmap
setting. The resulting filename may then be altered if runique is on.

5. For mput commands and put commands with unspecified remote file names, the remote
filename is the local filename, which may be altered by a ntrans or nmap setting. The
resulting filename may then be altered by the remote server if sunique is on.

FILE TRANSFER PARAMETERS

     The FTP specification specifies many parameters which may affect a file transfer.  The type
     may be one of “ascii”, “image” (binary), “ebcdic”, and “local byte size” (for PDP-10's and
     PDP-20's mostly).  tnftp supports the ascii and image types of file transfer, plus local
     byte size 8 for tenex mode transfers.

     tnftp supports only the default values for the remaining file transfer parameters: mode,
     form, and struct.

THE .netrc FILE

The .netrc file contains login and initialization information used by the auto-login
process. It resides in the user's home directory, unless overridden with the -N netrc
option, or specified in the NETRC environment variable. The following tokens are
recognized; they may be separated by spaces, tabs, or new-lines:

machine name
Identify a remote machine name. The auto-login process searches the .netrc file
for a machine token that matches the remote machine specified on the tnftp command
line or as an open command argument. Once a match is made, the subsequent .netrc
tokens are processed, stopping when the end of file is reached or another machine
or a default token is encountered.

default This is the same as machine name except that default matches any name. There can
be only one default token, and it must be after all machine tokens. This is
normally used as:

default login anonymous password user@site

thereby giving the user an automatic anonymous FTP login to machines not specified
in .netrc. This can be overridden by using the -n flag to disable auto-login.

login name
Identify a user on the remote machine. If this token is present, the auto-login
process will initiate a login using the specified name.

password string
Supply a password. If this token is present, the auto-login process will supply
the specified string if the remote server requires a password as part of the login
process. Note that if this token is present in the .netrc file for any user other
than anonymous, tnftp will abort the auto-login process if the .netrc is readable
by anyone besides the user.

account string
Supply an additional account password. If this token is present, the auto-login
process will supply the specified string if the remote server requires an
additional account password, or the auto-login process will initiate an ACCT
command if it does not.

macdef name
Define a macro. This token functions like the tnftp macdef command functions. A
macro is defined with the specified name; its contents begin with the next .netrc
line and continue until a blank line (consecutive new-line characters) is
encountered. Like the other tokens in the .netrc file, a macdef is applicable
only to the machine definition preceding it. A macdef entry cannot be used by
multiple machine definitions; rather, it must be defined following each machine it
is intended to be used with. If a macro named init is defined, it is
automatically executed as the last step in the auto-login process. For example,

default
macdef init
epsv4 off

followed by a blank line.

COMMAND LINE EDITING

     tnftp supports interactive command line editing, via the editline(3) library.  It is enabled
     with the edit command, and is enabled by default if input is from a tty.  Previous lines can
     be recalled and edited with the arrow keys, and other GNU Emacs-style editing keys may be
     used as well.

     The editline(3) library is configured with a .editrc file — refer to editrc(5) for more
     information.

     An extra key binding is available to tnftp to provide context sensitive command and filename
     completion (including remote file completion).  To use this, bind a key to the editline(3)
     command ftp-complete.  By default, this is bound to the TAB key.

COMMAND LINE PROMPT

     By default, tnftp displays a command line prompt of ‘ftp> ’ to the user.  This can be
     changed with the set prompt command.

     A prompt can be displayed on the right side of the screen (after the command input) with the
     set rprompt command.

     The following formatting sequences are replaced by the given information:

           %/   The current remote working directory.

           %c[[0]n], %.[[0]n]
                The trailing component of the current remote working directory, or n trailing
                components if a digit n is given.  If n begins with ‘0’, the number of skipped
                components precede the trailing component(s) in the format “/<number>trailing”
                (for ‘%c’) or “...trailing” (for ‘%.’).

           %M   The remote host name.

           %m   The remote host name, up to the first dot ‘.’.

           %n   The remote user name.

           %%   A single percent character ‘%’.

ENVIRONMENT

tnftp uses the following environment variables.

FTPANONPASS Password to send in an anonymous FTP transfer. Defaults to “`whoami`@”.

FTPMODE Overrides the default operation mode. Support values are:

active active mode FTP only

auto automatic determination of passive or active (this is the default)

gate gate-ftp mode

passive passive mode FTP only

FTPPROMPT Command-line prompt to use. Defaults to ‘ftp> ’. Refer to COMMAND LINE
PROMPT for more information.

FTPRPROMPT Command-line right side prompt to use. Defaults to empty string. Refer to
COMMAND LINE PROMPT for more information.

FTPSERVER Host to use as gate-ftp server when gate is enabled.

FTPSERVERPORT Port to use when connecting to gate-ftp server when gate is enabled. Default
is port returned by a getservbyname(3) lookup of “ftpgate/tcp”.

FTPUSERAGENT The value to send for the HTTP User-Agent header.

FTPSSLNOVERIFY
Set to 1 to not verify SSL certificates.

HOME For default location of a .netrc file, if one exists.

NETRC An alternate location of the .netrc file.

PAGER Used by various commands to display files. Defaults to more(1) if empty or
not set.

SHELL For default shell.

ftp_proxy URL of FTP proxy to use when making FTP URL requests (if not defined, use the
standard FTP protocol).

See http_proxy for further notes about proxy use.

http_proxy URL of HTTP proxy to use when making HTTP URL requests. If proxy
authentication is required and there is a username and password in this URL,
they will automatically be used in the first attempt to authenticate to the
proxy.

If “unsafe” URL characters are required in the username or password (for
example ‘@’ or ‘/’), encode them with RFC 3986 ‘%XX’ encoding.

Note that the use of a username and password in ftp_proxy and http_proxy may
be incompatible with other programs that use it (such as lynx(1)).

NOTE: this is not used for interactive sessions, only for command-line
fetches.

https_proxy URL of HTTPS proxy to use when making HTTPS URL requests.