1mNAME0m
       tclsh - Simple shell containing Tcl interpreter

1mSYNOPSIS0m
       1mtclsh 22m?4mfileName24m 4marg24m 4marg24m 4m...24m?


1mDESCRIPTION0m
       1mTclsh  22mis  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 stan-
       dard input and printing command results and error messages to  standard
       output.   It runs until the 1mexit 22mcommand is invoked or until it reaches
       end-of-file on its standard input.  If there exists a file 1m.tclshrc 22m(or
       1mtclshrc.tcl  22mon  the  Windows  platforms)  in the home directory of the
       user, 1mtclsh 22mevaluates the file as a Tcl script just before reading  the
       first command from standard input.


1mSCRIPT FILES0m
       If  1mtclsh 22mis 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 1mtclsh 22mwill read Tcl commands from the named file;  1mtclsh0m
       will  exit  when it reaches the end of the file.  There is no automatic
       evaluation of 1m.tclshrc 22min this case, but the  script  file  can  always
       1msource 22mit if desired.

       If you create a Tcl script in a file whose first line is
              1m#!/usr/local/bin/tclsh0m
       then  you  can  invoke  the script file directly from your shell if you
       mark the  file  as  executable.   This  assumes  that  1mtclsh  22mhas  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.
       Many  UNIX  systems do not allow the 1m#! 22mline to exceed about 30 charac-
       ters in length, so be sure that the 1mtclsh 22mexecutable  can  be  accessed
       with a short file name.

       An  even better approach is to start your script files with the follow-
       ing three lines:
              1m#!/bin/sh0m
              1m# the next line restarts using tclsh \0m
              1mexec tclsh "$0" "$@"0m
       This approach has three advantages over the approach  in  the  previous
       paragraph.   First, the location of the 1mtclsh 22mbinary doesn't 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  1mtclsh  22mis
       itself  a shell script (this is done on some systems in order to handle
       multiple architectures or operating systems:  the 1mtclsh 22mscript  selects
       one  of  several  binaries  to run).  The three lines cause both 1msh 22mand
       1mtclsh 22mto process the script, but the 1mexec 22mis only executed by  1msh22m.   1msh0m
       processes the script first;  it treats the second line as a comment and
       executes the third line.  The 1mexec 22mstatement cause the  shell  to  stop
       processing  and  instead  to  start  up  1mtclsh  22mto reprocess the entire
       script.  When 1mtclsh 22mstarts 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.


1mVARIABLES0m
       1mTclsh 22msets the following Tcl variables:

       1margc           22mContains a count of the number of 4marg24m  arguments  (0  if
                      none), not including the name of the script file.

       1margv           22mContains  a  Tcl  list  whose elements are the 4marg24m argu-
                      ments, in order, or an empty string if there are no  4marg0m
                      arguments.

       1margv0          22mContains  4mfileName24m if it was specified.  Otherwise, con-
                      tains the name by which 1mtclsh 22mwas invoked.

       1mtcl_interactive0m
                      Contains 1 if 1mtclsh 22mis running interactively  (no  4mfile-0m
                      4mName24m was specified and standard input is a terminal-like
                      device), 0 otherwise.


1mPROMPTS0m
       When 1mtclsh 22mis invoked interactively it normally prompts for  each  com-
       mand  with  ``1m% 22m''.  You can change the prompt by setting the variables
       1mtcl_prompt1 22mand 1mtcl_prompt222m.  If variable 1mtcl_prompt1  22mexists  then  it
       must consist of a Tcl script to output a prompt;  instead of outputting
       a prompt 1mtclsh 22mwill evaluate the script in 1mtcl_prompt122m.   The  variable
       1mtcl_prompt2  22mis  used  in a similar way when a newline is typed but the
       current command isn't yet complete; if 1mtcl_prompt2 22misn't  set  then  no
       prompt is output for incomplete commands.


1mKEYWORDS0m
