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Интерактивная система просмотра системных руководств (man-ов)

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tclsh ()
  • >> tclsh (1) ( Solaris man: Команды и прикладные программы пользовательского уровня )
  • tclsh (1) ( Linux man: Команды и прикладные программы пользовательского уровня )
  • 
    _________________________________________________________________
    
    NAME
         tclsh - Simple shell containing Tcl interpreter
    
    SYNOPSIS
         tclsh ?fileName arg arg ...?
    _________________________________________________________________
    
    
    DESCRIPTION
         Tclsh 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 com-
         mand results and error messages to standard output.  It runs
         until  the  exit command is invoked or until it reaches end-
         of-file on its standard  input.   If  there  exists  a  file
         .tclshrc  (or  tclshrc.tcl  on the Windows platforms) in the
         home directory of the user, tclsh evaluates the  file  as  a
         Tcl  script just before reading the first command from stan-
         dard input.
    
    
    SCRIPT FILES
         If tclsh 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 tclsh will
         read Tcl commands from the named file;  tclsh will exit when
         it  reaches  the  end  of  the  file.  There is no automatic
         evaluation of .tclshrc in this case, but the script file can
         always source it if desired.
    
         If you create a Tcl script in a file whose first line is
              #!/usr/local/bin/tclsh
         then you can invoke the script file directly from your shell
         if you mark the file as executable.  This assumes that tclsh
         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.   Many  UNIX
         systems  do not allow the #! line to exceed about 30 charac-
         ters in length, so be sure that the tclsh executable can  be
         accessed with a short file name.
    
         An even better approach is to start your script  files  with
         the following three lines:
              #!/bin/sh
              # the next line restarts using tclsh \
              exec tclsh "$0" "$@"
         This approach has three advantages over the approach in  the
         previous paragraph.  First, the location of the tclsh binary
         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 tclsh is itself a
         shell script (this is done on some systems in order to  han-
         dle  multiple architectures or operating systems:  the tclsh
         script selects one of several binaries to run).   The  three
         lines cause both sh and tclsh to process the script, but the
         exec is only executed by sh.  sh processes the script first;
         it  treats  the  second  line  as a comment and executes the
         third line.  The exec statement cause the shell to stop pro-
         cessing  and  instead  to  start  up  tclsh to reprocess the
         entire script.  When tclsh 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.
    
    
    VARIABLES
         Tclsh sets the following Tcl variables:
    
         argc           Contains a count of the number of  arg  argu-
                        ments  (0 if none), not including the name of
                        the script file.
    
         argv           Contains a Tcl list whose  elements  are  the
                        arg  arguments,  in order, or an empty string
                        if there are no arg arguments.
    
         argv0          Contains fileName if it was specified.   Oth-
                        erwise,  contains the name by which tclsh was
                        invoked.
    
         tcl_interactive
                        Contains 1 if tclsh is running  interactively
                        (no fileName was specified and standard input
                        is a terminal-like device), 0 otherwise.
    
    
    PROMPTS
         When tclsh is invoked interactively it normally prompts  for
         each command with ``% ''.  You can change the prompt by set-
         ting the variables tcl_prompt1 and tcl_prompt2.  If variable
         tcl_prompt1  exists  then it must consist of a Tcl script to
         output a prompt;  instead of outputting a prompt tclsh  will
         evaluate   the   script   in   tcl_prompt1.    The  variable
         tcl_prompt2 is used in a similar way when a newline is typed
         but  the  current command isn't yet complete; if tcl_prompt2
         isn't set then no prompt is output for incomplete commands.
    
    
    
    KEYWORDS
         argument, interpreter, prompt, script file, shell
    
    
    
    


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