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-'\"
-'\" Copyright (c) 1993 The Regents of the University of California.
-'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
-'\"
-'\" See the file "license.terms" for information on usage and redistribution
-'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-'\" 
-.TH tclsh 1 "" Tcl "Tcl Applications"
-.so man.macros
-.BS
-'\" Note:  do not modify the .SH NAME line immediately below!
-.SH NAME
-tclsh \- Simple shell containing Tcl interpreter
-.SH SYNOPSIS
-\fBtclsh\fR ?\fB\-encoding \fIname\fR? ?\fIfileName arg arg ...\fR?
-.BE
-.SH DESCRIPTION
-.PP
-\fBTclsh\fR is a shell-like application that reads Tcl commands
-from its standard input or from a file and evaluates them.
-If invoked with no arguments then it runs interactively, reading
-Tcl commands from standard input and printing command results and
-error messages to standard output.
-It runs until the \fBexit\fR command is invoked or until it
-reaches end-of-file on its standard input.
-If there exists a file \fB.tclshrc\fR (or \fBtclshrc.tcl\fR on
-the Windows platforms) in the home directory of
-the user, interactive \fBtclsh\fR evaluates the file as a Tcl script
-just before reading the first command from standard input.
-.SH "SCRIPT FILES"
-.PP
-If \fBtclsh\fR is invoked with arguments then the first few arguments
-specify the name of a script file, and, optionally, the encoding of
-the text data stored in that script file. Any additional arguments
-are made available to the script as variables (see below).
-Instead of reading commands from standard input \fBtclsh\fR will
-read Tcl commands from the named file;  \fBtclsh\fR will exit
-when it reaches the end of the file.
-The end of the file may be marked either by the physical end of
-the medium, or by the character,
-.QW \e032
-.PQ \eu001a ", control-Z" .
-If this character is present in the file, the \fBtclsh\fR application
-will read text up to but not including the character.  An application
-that requires this character in the file may safely encode it as
-.QW \e032 ,
-.QW \ex1a ,
-or
-.QW \eu001a ;
-or may generate it by use of commands such as \fBformat\fR or \fBbinary\fR.
-There is no automatic evaluation of \fB.tclshrc\fR when the name
-of a script file is presented on the \fBtclsh\fR command
-line, but the script file can always \fBsource\fR it if desired.
-.PP
-If you create a Tcl script in a file whose first line is
-.PP
-.CS
-\fB#!/usr/local/bin/tclsh\fR
-.CE
-.PP
-then you can invoke the script file directly from your shell if
-you mark the file as executable.
-This assumes that \fBtclsh\fR has been installed in the default
-location in /usr/local/bin;  if it is installed somewhere else
-then you will have to modify the above line to match.
-Many UNIX systems do not allow the \fB#!\fR line to exceed about
-30 characters in length, so be sure that the \fBtclsh\fR
-executable can be accessed with a short file name.
-.PP
-An even better approach is to start your script files with the
-following three lines:
-.PP
-.CS
-\fB#!/bin/sh
-# the next line restarts using tclsh \e
-exec tclsh "$0" ${1+"$@"}\fR
-.CE
-.PP
-This approach has three advantages over the approach in the previous
-paragraph.  First, the location of the \fBtclsh\fR binary does not have
-to be hard-wired into the script:  it can be anywhere in your shell
-search path.  Second, it gets around the 30-character file name limit
-in the previous approach.
-Third, this approach will work even if \fBtclsh\fR is
-itself a shell script (this is done on some systems in order to
-handle multiple architectures or operating systems:  the \fBtclsh\fR
-script selects one of several binaries to run).  The three lines
-cause both \fBsh\fR and \fBtclsh\fR to process the script, but the
-\fBexec\fR is only executed by \fBsh\fR.
-\fBsh\fR processes the script first;  it treats the second
-line as a comment and executes the third line.
-The \fBexec\fR statement cause the shell to stop processing and
-instead to start up \fBtclsh\fR to reprocess the entire script.
-When \fBtclsh\fR starts up, it treats all three lines as comments,
-since the backslash at the end of the second line causes the third
-line to be treated as part of the comment on the second line.
-.PP
-You should note that it is also common practice to install tclsh with
-its version number as part of the name.  This has the advantage of
-allowing multiple versions of Tcl to exist on the same system at once,
-but also the disadvantage of making it harder to write scripts that
-start up uniformly across different versions of Tcl.
-.SH "VARIABLES"
-.PP
-\fBTclsh\fR sets the following global Tcl variables in addition to those
-created by the Tcl library itself (such as \fBenv\fR, which maps
-environment variables such as \fBPATH\fR into Tcl):
-.TP 15
-\fBargc\fR
-.
-Contains a count of the number of \fIarg\fR arguments (0 if none),
-not including the name of the script file.
-.TP 15
-\fBargv\fR
-.
-Contains a Tcl list whose elements are the \fIarg\fR arguments,
-in order, or an empty string if there are no \fIarg\fR arguments.
-.TP 15
-\fBargv0\fR
-.
-Contains \fIfileName\fR if it was specified.
-Otherwise, contains the name by which \fBtclsh\fR was invoked.
-.TP 15
-\fBtcl_interactive\fR
-.
-Contains 1 if \fBtclsh\fR is running interactively (no
-\fIfileName\fR was specified and standard input is a terminal-like
-device), 0 otherwise.
-.SH PROMPTS
-.PP
-When \fBtclsh\fR is invoked interactively it normally prompts for each
-command with
-.QW "\fB% \fR" .
-You can change the prompt by setting the global
-variables \fBtcl_prompt1\fR and \fBtcl_prompt2\fR.  If variable
-\fBtcl_prompt1\fR exists then it must consist of a Tcl script
-to output a prompt;  instead of outputting a prompt \fBtclsh\fR
-will evaluate the script in \fBtcl_prompt1\fR.
-The variable \fBtcl_prompt2\fR is used in a similar way when
-a newline is typed but the current command is not yet complete;
-if \fBtcl_prompt2\fR is not set then no prompt is output for
-incomplete commands.
-.SH "STANDARD CHANNELS"
-.PP
-See \fBTcl_StandardChannels\fR for more explanations.
-.SH "SEE ALSO"
-auto_path(n), encoding(n), env(n), fconfigure(n)
-.SH KEYWORDS
-application, argument, interpreter, prompt, script file, shell