This global variable is provided by tclsh and wish mainline code (and '''NOT''' the tcl or tk libraries). It gives you the arguments the app was called with as a list, similar to C's argv, but without the app name itself (you get that in ''::[argv0]''). We don't need ''[argc]'' as we can always determine [[llength $argv]]. 

An example of making use of this variable is:

 #! /usr/local/bin/tclsh
 if { $::argc > 0 } {
        set i 1
        foreach arg $::argv {
                puts "argument $i is $arg"
                incr i
        }
  } else {
        puts "no command line argument passed"
  }


'''DGP''' -- It is true that we do not need ''::argc'', but
'''tclsh''' and '''wish''' and any application embedding Tcl
that calls ''Tcl_Main()'' provide it anyway.

[argv0] describes the name of the top-level script that was invoked via tclsh or wish.

http://purl.org/tcl/home/man/tcl8.3.2/UserCmd/tclsh.htm

http://purl.org/tcl/home/man/tcl8.3.2/UserCmd/wish.htm

See [command options] for a discussion of various options one has
in parsing the argv (and argv-like) information.

Also, note that [[[info] script]] describes the name of the currently executing script and this name even gets set by [source].
''Technically, it is set by Tcl_FSEvalFile(), for those using Tcl's C API.''

The command [[[info] nameofexecutable]] describes the name of the executing binary, and might be thought more like the C level argv[[0]].



Some code available that helps process the argv arguments include:

   * [clig (Kirsch)]
   * [CmdLine]

   * [evaluate_parameters]
 Where: ftp://ftp.Lehigh.EDU/pub/evap/evap-2.x/evap-2.2.tar.Z
        ftp://ftp.procplace.com/pub/tcl/sorted/packages-7.6/devel/evap-2.1.tar.gz
 Description: evaluate_parameters is a Perl program that
        processes command line arguments in a simple consistent manner
        performing type-checking, multi-levels of help, etc.
        generate_tk_program is an auxiliary program which generates
        a Tcl/Tk GUI wrapper around one's Perl or C program to gather
        the command line arguments interactively.
 Updated: 10/1999
 Contact: mailto:lusol@lehigh.edu (Stephen O. Lidie)

   * [ParseArgs]
   * [argp]
   * [argument parsing with defaults (Wagner)]
   * [argument processing for Tcl (Lehenbauer)]
   * [argument processing (Zimmer)]

   * [SimpleOpt]
 Where: From the contact
        http://simplelib.bobsville.com/
 Description: Tcl only argument parsing code
 Updated: 10/2001
 Contact: mailto:jcgil@gmv.es (Juan Carlos Gil Montoro)

   * [sneaky_eval]
 Where: From the contact
 Description: Preprocess arguments before calling RecordAndEval or Eval,
        surrounding the arguments with braces so they won't be sub-evaluated.
 Updated:
 Contact: mailto:mdimeo@brooktree.com (Matt DiMeo)

   * [SNTL]
 Where: http://www.csua.berkeley.edu/%7Esls/woa/distrib/
        ftp://ftp.procplace.com/pub/tcl/sorted/packages-7.6/devel/sntl-0.4.2.tar.gz
        ftp://ftp.procplace.com/pub/tcl/sorted/packages-7.6/devel/sntl-0.4.2p1.patch.tar.gz
 Description: A general Tcl library of procedures.  Contains code to
        produce man pages from Tcl source, conversions from Tcl to C,
        HTML rendering, generating HTML, handling CGI forms, command line
        argument processing, a debugging message system, an object system,
        and various Tk widgets built with the object system.
 Updated: 10/1998
 Contact: mailto:slshen@lbl.gov (Sam Shen)
        mailto:sls@aero.org (Sam Shen)

   * [variable argument process]
   * [yaap - Yet Another Argument Parsing utility]
   * [command options]

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[Category Argument Processing] |
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