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Full Discussion: How to change Linux Terminal environment variable in a perl or bash script?
Top Forums Shell Programming and Scripting How to change Linux Terminal environment variable in a perl or bash script? Post 302836537 by weichanghe2000 on Thursday 25th of July 2013 09:32:20 AM
Old 07-25-2013
Quote:
Originally Posted by Corona688
A more flexible version:

Code:
#!/usr/bin/perl

$ENV{MYVAR}="asdf";

my $shell=shift;
if($shell) {
        exec $shell, @ARGV;
}
else
{
        exec "bash", "-sh";
}

When not given a shell it assumes bash, otherwise it runs what you tell it on the commandline.
You did a great job.
Thanks very much!
I will try do this method and verify it whether fulfill my requirement.

---------- Post updated 07-25-13 at 08:32 AM ---------- Previous update was 07-24-13 at 09:33 AM ----------

Quote:
Originally Posted by Corona688
A more flexible version:

Code:
#!/usr/bin/perl

$ENV{MYVAR}="asdf";

my $shell=shift;
if($shell) {
        exec $shell, @ARGV;
}
else
{
        exec "bash", "-sh";
}

When not given a shell it assumes bash, otherwise it runs what you tell it on the commandline.
I have already used your solution, but there is some problem as follows:
Our shell version is tcshrc, the terminal prompt like cm280:/home/wch> set in .tcshrc.
But the terminal prompt will become '%' only after executing './1.pl csh' using your method although the variable MYVAR has been changed as 'asdf'.

There cannot change Termina environment MYVAR as 'asdf' at all when executing option './1.pl csh -f'.

Is this any good suggestion and solution in tcshrc ?
I am looking forward to your answer.
Thanks greatly.
 

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LEARN ABOUT OSX

platform::shell

platform::shell(n)					       Tcl Bundled Packages						platform::shell(n)

__________________________________________________________________________________________________________________________________________________

NAME

       platform::shell - System identification support code and utilities

SYNOPSIS

       package require platform::shell ?1.1.4?

       platform::shell::generic shell
       platform::shell::identify shell
       platform::shell::platform shell
_________________________________________________________________

DESCRIPTION

       The platform::shell package provides several utility commands useful for the identification of the architecture of a specific Tcl shell.

       This  package  allows the identification of the architecture of a specific Tcl shell different from the shell running the package. The only
       requirement is that the other shell (identified by its path), is actually executable on the current machine.

       While for most platform this means that the architecture of the interrogated shell is identical to the architecture of  the  running  shell
       this  is  not generally true. A counter example are all platforms which have 32 and 64 bit variants and where a 64bit system is able to run
       32bit code. For these running and interrogated shell may have different 32/64 bit settings and thus different identifiers.

       For applications like a code repository it is important to identify the architecture of the shell which will  actually  run  the  installed
       packages, versus the architecture of the shell running the repository software.

COMMANDS

       platform::shell::identify shell
	      This command does the same identification as platform::identify, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::generic shell
	      This command does the same identification as platform::generic, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::platform shell
	      This command returns the contents of tcl_platform(platform) for the specified Tcl shell.

KEYWORDS

       operating system, cpu architecture, platform, architecture

platform::shell 						       1.1.4							platform::shell(n)
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