Hi,

Sorry, this is probably a really basic question. I'm running into a
problem where my csh script stops because it's referencing environment
variables that have not been set.

In order to prevent this from happening, I'd like to behave gracefully
if the environment variable isn't set, instead of just getting the
"Undefined variable" message.

Is there a way to check if an environment variable is set before using
it in csh?

Thanks!
Michael Jeung

In article <1180113185.243991.198730@x18g2000prd.googlegroups .com>,
<jeungster@gmail.com> wrote:
>Hi,
>
>Sorry, this is probably a really basic question. I'm running into a
>problem where my csh script stops because it's referencing environment
>variables that have not been set.
>
>In order to prevent this from happening, I'd like to behave gracefully
>if the environment variable isn't set, instead of just getting the
>"Undefined variable" message.
>
>Is there a way to check if an environment variable is set before using
>it in csh?
>
>Thanks!
>Michael Jeung
>

if $?foo ...

> if $?foo ...

Thanks! That's works exactly.