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Help with a shell syntax

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#1 (permalink)

07-26-2007

vibhor_agarwali vibhor_agarwali is offline

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Join Date: Jan 2005

Posts: 259

Help with a shell syntax

I have a variable named "xyz"

Now what will the below snippet mean:

if ( ${?xyz} ) then
....
endif

What does ? signify here.

Thanks

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