Provided by: tcl8.4-doc_8.4.20-8_all 
NAME
info - Return information about the state of the Tcl interpreter
SYNOPSIS
info option ?arg arg ...?
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DESCRIPTION
This command provides information about various internals of the Tcl interpreter. The
legal option's (which may be abbreviated) are:
info args procname
Returns a list containing the names of the arguments to procedure procname, in
order. Procname must be the name of a Tcl command procedure.
info body procname
Returns the body of procedure procname. Procname must be the name of a Tcl command
procedure.
info cmdcount
Returns a count of the total number of commands that have been invoked in this
interpreter.
info commands ?pattern?
If pattern isn't specified, returns a list of names of all the Tcl commands in the
current namespace, including both the built-in commands written in C and the
command procedures defined using the proc command. If pattern is specified, only
those names matching pattern are returned. Matching is determined using the same
rules as for string match. pattern can be a qualified name like Foo::print*. That
is, it may specify a particular namespace using a sequence of namespace names
separated by double colons (::), and may have pattern matching special characters
at the end to specify a set of commands in that namespace. If pattern is a
qualified name, the resulting list of command names has each one qualified with the
name of the specified namespace.
info complete command
Returns 1 if command is a complete Tcl command in the sense of having no unclosed
quotes, braces, brackets or array element names. If the command doesn't appear to
be complete then 0 is returned. This command is typically used in line-oriented
input environments to allow users to type in commands that span multiple lines; if
the command isn't complete, the script can delay evaluating it until additional
lines have been typed to complete the command.
info default procname arg varname
Procname must be the name of a Tcl command procedure and arg must be the name of an
argument to that procedure. If arg doesn't have a default value then the command
returns 0. Otherwise it returns 1 and places the default value of arg into
variable varname.
info exists varName
Returns 1 if the variable named varName exists in the current context (either as a
global or local variable) and has been defined by being given a value, returns 0
otherwise. │
info functions ?pattern? │
If pattern isn't specified, returns a list of all the math functions currently │
defined. If pattern is specified, only those functions whose name matches pattern │
are returned. Matching is determined using the same rules as for string match.
info globals ?pattern?
If pattern isn't specified, returns a list of all the names of currently-defined
global variables. Global variables are variables in the global namespace. If
pattern is specified, only those names matching pattern are returned. Matching is
determined using the same rules as for string match.
info hostname
Returns the name of the computer on which this invocation is being executed. Note │
that this name is not guaranteed to be the fully qualified domain name of the host. │
Where machines have several different names (as is common on systems with both │
TCP/IP (DNS) and NetBIOS-based networking installed,) it is the name that is │
suitable for TCP/IP networking that is returned.
info level ?number?
If number is not specified, this command returns a number giving the stack level of
the invoking procedure, or 0 if the command is invoked at top-level. If number is
specified, then the result is a list consisting of the name and arguments for the
procedure call at level number on the stack. If number is positive then it selects
a particular stack level (1 refers to the top-most active procedure, 2 to the
procedure it called, and so on); otherwise it gives a level relative to the current
level (0 refers to the current procedure, -1 to its caller, and so on). See the
uplevel command for more information on what stack levels mean.
info library
Returns the name of the library directory in which standard Tcl scripts are stored.
This is actually the value of the tcl_library variable and may be changed by
setting tcl_library. See the tclvars manual entry for more information.
info loaded ?interp?
Returns a list describing all of the packages that have been loaded into interp
with the load command. Each list element is a sub-list with two elements
consisting of the name of the file from which the package was loaded and the name
of the package. For statically-loaded packages the file name will be an empty
string. If interp is omitted then information is returned for all packages loaded
in any interpreter in the process. To get a list of just the packages in the
current interpreter, specify an empty string for the interp argument.
info locals ?pattern?
If pattern isn't specified, returns a list of all the names of currently-defined
local variables, including arguments to the current procedure, if any. Variables
defined with the global, upvar and variable commands will not be returned. If
pattern is specified, only those names matching pattern are returned. Matching is
determined using the same rules as for string match.
info nameofexecutable
Returns the full path name of the binary file from which the application was
invoked. If Tcl was unable to identify the file, then an empty string is returned.
info patchlevel
Returns the value of the global variable tcl_patchLevel; see the tclvars manual
entry for more information.
info procs ?pattern?
If pattern isn't specified, returns a list of all the names of Tcl command
procedures in the current namespace. If pattern is specified, only those procedure
names in the current namespace matching pattern are returned. Matching is
determined using the same rules as for string match. If pattern contains any
namespace separators, they are used to select a namespace relative to the current
namespace (or relative to the global namespace if pattern starts with ::) to match
within; the matching pattern is taken to be the part after the last namespace
separator.
info script ?filename?
If a Tcl script file is currently being evaluated (i.e. there is a call to
Tcl_EvalFile active or there is an active invocation of the source command), then
this command returns the name of the innermost file being processed. If filename
is specified, then the return value of this command will be modified for the
duration of the active invocation to return that name. This is useful in virtual
file system applications. Otherwise the command returns an empty string.
info sharedlibextension
Returns the extension used on this platform for the names of files containing
shared libraries (for example, .so under Solaris). If shared libraries aren't
supported on this platform then an empty string is returned.
info tclversion
Returns the value of the global variable tcl_version; see the tclvars manual entry
for more information.
info vars ?pattern?
If pattern isn't specified, returns a list of all the names of currently-visible
variables. This includes locals and currently-visible globals. If pattern is
specified, only those names matching pattern are returned. Matching is determined
using the same rules as for string match. pattern can be a qualified name like
Foo::option*. That is, it may specify a particular namespace using a sequence of
namespace names separated by double colons (::), and may have pattern matching
special characters at the end to specify a set of variables in that namespace. If
pattern is a qualified name, the resulting list of variable names has each matching
namespace variable qualified with the name of its namespace. Note that a
currently-visible variable may not yet "exist" if it has not been set (e.g. a
variable declared but not set by variable).
EXAMPLE
This command prints out a procedure suitable for saving in a Tcl script:
proc printProc {procName} {
set result [list proc $procName]
set formals {}
foreach var [info args $procName] {
if {[info default $procName $var def]} {
lappend formals [list $var $def]
} else {
# Still need the list-quoting because variable
# names may properly contain spaces.
lappend formals [list $var]
}
}
puts [lappend result $formals [info body $procName]]
}
SEE ALSO
global(3tcl), proc(3tcl)
KEYWORDS
command, information, interpreter, level, namespace, procedure, variable