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cannot modify LINUX env vars

by ISAI student (Scribe)
on Feb 06, 2011 at 09:28 UTC ( #886490=perlquestion: print w/replies, xml ) Need Help??
ISAI student has asked for the wisdom of the Perl Monks concerning the following question:

Hello all. I am trying to set LINUX environment variables via the %ENV and fail. The chanegs I do to the %ENV do not "stick" at all. I have tried even a simple perl -e and failed. See 1 line two commands LINUX output:
perl -e '$ENV{'pathy'}="kuku"; echo $pathy
I would have expected:
perl -e '$ENV{'pathy'}="kuku"; echo $pathy kuku

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Re: cannot modify LINUX env vars
by eyepopslikeamosquito (Chancellor) on Feb 06, 2011 at 09:54 UTC
Re: cannot modify LINUX env vars
by Corion (Pope) on Feb 06, 2011 at 09:39 UTC

    That's not how the environment works. Changes are only visible to the current process and its children. You cannot change the "upwards" environment.

    The traditional technique is to output a shell script that the "upper" process then evaluates:

    # In the parent shell do: $(perl -wle 'print "export pathy=kuku') echo $pathy
Re: cannot modify LINUX env vars
by Khen1950fx (Canon) on Feb 06, 2011 at 18:15 UTC
    I tried setenv. I modified the source and used this:
    #!/usr/bin/perl use strict; use warnings; setter( $ENV{'pathy'} = 'kuku' ); system("env"); sub setter { shift; while ( my ( $key, $value ) = splice @_, 0, 2 ) { $ENV{$key} = $value; } return; }

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