Ubuntu Manpage: Net::SCP - Perl extension for secure copy protocol

NAME

       Net::SCP - Perl extension for secure copy protocol

SYNOPSIS

         #procedural interface
         use Net::SCP qw(scp iscp);
         scp($source, $destination);
         iscp($source, $destination); #shows command, asks for confirmation, and
                                      #allows user to type a password on tty

         #OO interface
         $scp = Net::SCP->new( "hostname", "username" );
         #with named params
         $scp = Net::SCP->new( { "host"=>$hostname, "user"=>$username } );
         $scp->get("filename") or die $scp->{errstr};
         $scp->put("filename") or die $scp->{errstr};
         #tmtowtdi
         $scp = new Net::SCP;
         $scp->scp($source, $destination);

         #Net::FTP-style
         $scp = Net::SCP->new("hostname");
         $scp->login("user");
         $scp->cwd("/dir");
         $scp->size("file");
         $scp->get("file");

DESCRIPTION

       Simple wrappers around ssh and scp commands.

SUBROUTINES

       scp SOURCE, DESTINATION
           Can be called either as a subroutine or a method; however, the subroutine interface is
           deprecated.

           Calls scp in batch mode, with the -B -p -q and -r options.  Returns false upon error,
           with a text error message accessible in $scp->{errstr}.

           Returns false and sets the errstr attribute if there is an error.

       iscp SOURCE, DESTINATION
           Can be called either as a subroutine or a method; however, the subroutine interface is
           deprecated.

           Prints the scp command to be execute, waits for the user to confirm, and (optionally)
           executes scp, with the -p and -r flags.

           Returns false and sets the errstr attribute if there is an error.

METHODS

new HOSTNAME [ USER ] | HASHREF
This is the constructor for a new Net::SCP object. You must specify a hostname, and
may optionally provide a user. Alternatively, you may pass a hashref of named params,
with the following keys:

host - hostname
user - username
interactive - bool
cwd - current working directory on remote server

cwd CWD
Sets the cwd (used for a subsequent get or put request without a full pathname).

get REMOTE_FILE [, LOCAL_FILE]
Uses scp to transfer REMOTE_FILE from the remote host. If a local filename is
omitted, uses the basename of the remote file.

mkdir DIRECTORY
Makes a directory on the remote server. Returns false and sets the errstr attribute
on errors.

(Implementation note: An ssh connection is established to the remote machine and
'/bin/mkdir -p' is used to create the directory.)

size FILE
Returns the size in bytes for the given file as stored on the remote server. Returns
0 on error, and sets the errstr attribute. In the case of an actual zero-length file
on the remote server, the special value '0e0' is returned, which evaluates to zero
when used as a number, but is true.

(Implementation note: An ssh connection is established to the remote machine and wc is
used to determine the file size.)

put LOCAL_FILE [, REMOTE_FILE]
Uses scp to trasnfer LOCAL_FILE to the remote host. If a remote filename is omitted,
uses the basename of the local file.

binary
Compatibility method: does nothing; returns true.

quit
Compatibility method: does nothing; returns true.

FREQUENTLY ASKED QUESTIONS

       Q: How do you supply a password to connect with ssh within a perl script using the
       Net::SSH module?

       A: You don't (at least not with this module).  Use RSA or DSA keys.  See the
          quick help in the next section and the ssh-keygen(1) manpage.

       A #2: See Net::SCP::Expect instead.

       Q: My script is "leaking" scp processes.

       A: See "How do I avoid zombies on a Unix system" in perlfaq8, IPC::Open2, IPC::Open3 and
       "waitpid" in perlfunc.

GENERATING AND USING SSH KEYS

       1 Generate keys
           Type:

              ssh-keygen -t rsa

           And do not enter a passphrase unless you wanted to be prompted for one during file
           copying.

           Here is what you will see:

              $ ssh-keygen -t rsa
              Generating public/private rsa key pair.
              Enter file in which to save the key (/home/User/.ssh/id_rsa):
              Enter passphrase (empty for no passphrase):

              Enter same passphrase again:

              Your identification has been saved in /home/User/.ssh/id_rsa.
              Your public key has been saved in /home/User/.ssh/id_rsa.pub.
              The key fingerprint is:
              5a:cd:2b:0a:cd:d9:15:85:26:79:40:0c:55:2a:f4:23 User@JEFF-CPU

       2 Copy public to machines you want to upload to
           "id_rsa.pub" is your public key. Copy it to "~/.ssh" on target machine.

           Put a copy of the public key file on each machine you want to log into.  Name the copy
           "authorized_keys" (some implementations name this file "authorized_keys2")

           Then type:

                chmod 600 authorized_keys

           Then make sure your home dir on the remote machine is not group or world writeable.

AUTHORS

       Could really use a maintainer with enough time to at least review and apply patches more
       patches.  Or the module should just be deprecated in favor of Net::SFTP::Expect or
       Net::SFTP::Foreign and made into a simple compatibility wrapper.

       Ivan Kohler <ivan-netscp_pod@420.am>

       Major updates Anthony Deaver <bishop@projectmagnus.org>

       Thanks to Jon Gunnip <jon@soundbite.com> for fixing a bug with size().

       Patch for the mkdir method by Anthony Awtrey <tony@awtrey.com>.

       Thanks to terrence brannon <tbone@directsynergy.com> for the documentation in the
       GENERATING AND USING SSH KEYS section.

COPYRIGHT

       Copyright (c) 2000 Ivan Kohler Copyright (c) 2007 Freeside Internet Services, Inc.  All
       rights reserved.  This program is free software; you can redistribute it and/or modify it
       under the same terms as Perl itself.

BUGS

       Still has no-OO cruft.

       In order to work around some problems with commercial SSH2, if the source file is on the
       local system, and is not a directory, the -r flag is omitted.  It's probably better just
       to use OpenSSH <http://www.openssh.com/> which is the de-facto standard these days anyway.

       The Net::FTP-style OO stuff is kinda lame.  And incomplete.

       iscp doesn't expect you to be logging into the box that you are copying to for the first
       time. so it's completely clueless about how to handle  the whole 'add this file to known
       hosts' message so it just hangs after the user hits y.  (Thanks to John L. Utz III).  To
       avoid this, SSH to the box once first.