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Re: Re: UNIX environment setup via perl

by haoess (Curate)
on May 07, 2004 at 16:22 UTC ( #351511=note: print w/ replies, xml ) Need Help??


in reply to Re: UNIX environment setup via perl
in thread UNIX environment setup via perl

> You should check for $ENV{SHELL} and emit "setenv VAR VALUE"
> lines if appropriate.

$ENV{SHELL} is not a way to determine your current shell. $ENV{SHELL} is your »preferred shell« (aka login shell in /etc/passwd), see The Single UNIX Specification, Version 3.

Example:

# we are in bash, all is fine $ eval `perl -le 'print $ENV{SHELL} =~ /csh/ ? "setenv FOO bar" : "exp +ort FOO=bar"'` # now we switch to tcsh $ tcsh $ eval `perl -le 'print $ENV{SHELL} =~ /csh/ ? "setenv FOO bar" : "exp +ort FOO=bar"'` $ export: Command not found. $ echo $SHELL /bin/bash

It seems that there is no portable way to find out the name of your current shell. We discussed that some time ago at de.comp.os.unix.shell.

Replies are listed 'Best First'.
Re: Re: Re: UNIX environment setup via perl
by eserte (Deacon) on May 07, 2004 at 17:24 UTC
    Looking at $ENV{SHELL} is probably the best we can do --- other programs seem to do it the same way (and therefore do it wrong):
    $ env SHELL=/bin/sh ssh-agent SSH_AUTH_SOCK=/tmp/ssh-XXN54U4g/agent.3950; export SSH_AUTH_SOCK; SSH_AGENT_PID=3951; export SSH_AGENT_PID; echo Agent pid 3951;
    $ env SHELL=/bin/tcsh ssh-agent setenv SSH_AUTH_SOCK /tmp/ssh-XXPC7hgb/agent.3948; setenv SSH_AGENT_PID 3949; echo Agent pid 3949;
    Similar output for /usr/X11/bin/resize

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