Re: unsetenv in the shell

Si <smcbutler@xxxxxxxxx> wrote:

hi, i have a perl program that calls another application. this second
application uses the value of certain environment variables during its
operation. i'm having trouble with unsetting those variables during
the course of the perl script.

my (wrong) pseudo code:

$var1 = $ENV{'VAR1};
$var2 = $ENV{'VAR2'};
$var3 = $ENV{'VAR3'};

system( "unsetenv VAR1");
system( "unsetenv VAR2");
system( "unsetenv VAR3");

"Unsetting" an environment variable is in no way different from setting it.
Your case is a variation of the FAQs:
I {changed directory, modified my environment} in a perl script. How come
the change disappeared when I exited the script? How do I get my changes to
be visible?

Just do those changes in the script itself instead of in a child process
(perldoc -f delete)

jue
.

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