Question:How to check if ENV_VAR is defined

[mjamon]

Hello all,

I am new to scripting and I am using C Shell Script.

I can't find a way to check if an environment variable is defined/set already.

I found some test procedures like

if ( -z somefile )
# something to do here
else
# something to do here
endif

but all that i found check only file existence.

Do you know any test procedure that i can put in an if statement to check whether an environment variable is defined.

For example:

if( -defined $MY_ENV_VAR )
echo "env var defined"
else
echo "env var undefined"
endif

Thanks all.

[Freston]

Just check if the variable contains something/anything
if [ $VAR ] ; then