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Re: Env Variable value not persistent

by hiseldl (Priest)
on Dec 15, 2006 at 15:06 UTC ( #590038=note: print w/replies, xml ) Need Help??

in reply to Env Variable value not persistent

I don't know what you will be using it for, but if you just want to run a couple commands, then a sub-shell may work for you; just exit from the subshell, when you're done...

# I use bash, but you can put csh here, if you want # I added "--norc" so that PS1 is not overridden $ perl -e '$ENV{SQUIRREL}="brown";$ENV{PS1}="subshell> ";system("bash" +, "--norc")' subshell> echo $SQUIRREL brown subshell> exit exit $ echo $SQUIRREL $

The problem here is that you may forget that you're in a sub-shell and spawn several subshells. One way to address that is to add an environment variable to your script, say, for example, $ENV{MYSCRIPTISRUNNING}="YES", then you could simply exit if this env variable exists, preventing multiple subshells. This is not foolproof, but it's a start.

N.B. This creates a sub-shell, and the env changes will be lost once you exit all the way out back to your original shell.


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