info(TCL)

info -- return information about the state of the Tcl interpreter

Syntax

info option [arg arg ...]

Description

This command provides information about various internals of the Tcl interpreter. The legal options (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, 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.
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), returns 0 otherwise.
info globals [pattern]: If pattern isn't specified, returns a list of all the names of currently-defined global variables. If pattern is specified, only those names matching pattern are returned. Matching is determined using the same rules as for string match.
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. The default value for the library is compiled into Tcl, but it may be overridden by setting the TCL_LIBRARY environment variable. If there is no TCL_LIBRARY variable and no compiled-in value then an error is generated. See the library(TCL) manual entry for details of the facilities provided by the Tcl script library. Normally each application will have its own application-specific script library in addition to the Tcl script library. Each application should consider setting a global variable with a name like $app_library (where app is the application's name) to hold the location of that application's library directory.
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 and upvar 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 patchlevel: Returns a decimal integer giving the current patch level for Tcl. The patch level is incremented for each new release or patch, and it uniquely identifies an official version of Tcl.
info procs [pattern]: If pattern isn't specified, returns a list of all the names of Tcl command procedures. If pattern is specified, only those names matching pattern are returned. Matching is determined using the same rules as for string match.
info script: If a Tcl script file is currently being evaluated (that is, 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. Otherwise the command returns an empty string.
info tclversion: Returns the version number for this version of Tcl in the form x.y, where changes to x represent major changes with probable incompatibilities and changes to y represent small enhancements and bug fixes that retain backward compatibility.
info vars [pattern]: If pattern isn't specified, returns a list of all the names of currently-visible variables, including both 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.