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1994-09-20
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285 lines
'\"
'\" Copyright (c) 1993 The Regents of the University of California.
'\" All rights reserved.
'\"
'\" Permission is hereby granted, without written agreement and without
'\" license or royalty fees, to use, copy, modify, and distribute this
'\" documentation for any purpose, provided that the above copyright
'\" notice and the following two paragraphs appear in all copies.
'\"
'\" IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
'\" FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
'\" ARISING OUT OF THE USE OF THIS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
'\" CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
'\"
'\" THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
'\" INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
'\" AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
'\" ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
'\" PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
'\"
'\" $Header: /user6/ouster/tcl/man/RCS/tclsh.1,v 1.4 93/08/26 15:06:04 ouster Exp $ SPRITE (Berkeley)
'/"
.\" The definitions below are for supplemental macros used in Tcl/Tk
.\" manual entries.
.\"
.\" .HS name section [date [version]]
.\" Replacement for .TH in other man pages. See below for valid
.\" section names.
.\"
.\" .AP type name in/out [indent]
.\" Start paragraph describing an argument to a library procedure.
.\" type is type of argument (int, etc.), in/out is either "in", "out",
.\" or "in/out" to describe whether procedure reads or modifies arg,
.\" and indent is equivalent to second arg of .IP (shouldn't ever be
.\" needed; use .AS below instead)
.\"
.\" .AS [type [name]]
.\" Give maximum sizes of arguments for setting tab stops. Type and
.\" name are examples of largest possible arguments that will be passed
.\" to .AP later. If args are omitted, default tab stops are used.
.\"
.\" .BS
.\" Start box enclosure. From here until next .BE, everything will be
.\" enclosed in one large box.
.\"
.\" .BE
.\" End of box enclosure.
.\"
.\" .VS
.\" Begin vertical sidebar, for use in marking newly-changed parts
.\" of man pages.
.\"
.\" .VE
.\" End of vertical sidebar.
.\"
.\" .DS
.\" Begin an indented unfilled display.
.\"
.\" .DE
.\" End of indented unfilled display.
.\"
'\" # Heading for Tcl/Tk man pages
.de HS
.ds ^3 \\0
.if !"\\$3"" .ds ^3 \\$3
.if '\\$2'cmds' .TH \\$1 1 \\*(^3 \\$4
.if '\\$2'lib' .TH \\$1 3 \\*(^3 \\$4
.if '\\$2'tcl' .TH \\$1 n \\*(^3 Tcl "Tcl Built-In Commands"
.if '\\$2'tk' .TH \\$1 n \\*(^3 Tk "Tk Commands"
.if '\\$2'tclc' .TH \\$1 3 \\*(^3 Tcl "Tcl Library Procedures"
.if '\\$2'tkc' .TH \\$1 3 \\*(^3 Tk "Tk Library Procedures"
.if '\\$2'tclcmds' .TH \\$1 1 \\*(^3 Tk "Tcl Applications"
.if '\\$2'tkcmds' .TH \\$1 1 \\*(^3 Tk "Tk Applications"
.if t .wh -1.3i ^B
.nr ^l \\n(.l
.ad b
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.ie !"\\$4"" .TP \\$4
.el \{\
. ie !"\\$2"" .TP \\n()Cu
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.\}
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.ta \\n()Au \\n()Bu
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.el \{\
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.nr )A 10n
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.\"
.if !"\\$2"" .nr )B \\w'\\$2'u+\\n()Au+3n
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\h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\l'|0u-1.5n\(ul'
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'\" # DS - begin display
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..
.HS tclsh tclcmds
.BS
'\" Note: do not modify the .SH NAME line immediately below!
.SH NAME
tclsh \- Simple shell containing Tcl interpreter
.SH SYNOPSIS
\fBtclsh\fR ?\fIfileName arg arg ...\fR?\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 in the home directory of
the user, \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 argument
is the name of a script file and 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.
There is no automatic evaluation of \fB.tclshrc\fR in this
case, 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
.DS
\fB#!/usr/local/bin/tclsh
.DE
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's installed somewhere else
then you'll have to modify the above line to match.
.SH "VARIABLES"
.PP
\fBTclsh\fR sets the following Tcl variables:
.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.
.LP
.SH PROMPTS
.PP
When \fBtclsh\fR is invoked interactively it normally prompts for each
command with ``\fB% \fR''. You can change the prompt by setting the
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 isn't yet complete;
if \fBtcl_prompt2\fR isn't set then no prompt is output for
incomplete commands.
.SH KEYWORDS
argument, interpreter, prompt, script file, shell