Can you tell if a C-shell variable is numeric?

[Root Boy Jim]

? From: Vijay Sundaram <sundaram at VX2.GBA.NYU.EDU>

? Hi gurus,

? A question on the C-shell.  I'm writing a C-shell script (no flames please!)
? and I need to determine if a shell variable is a number as opposed to a 
? string.  

expr $var + 0 >& /dev/null || exit

	(Root Boy) Jim Cottrell	<rbj at icst-cmr.arpa>
	National Bureau of Standards
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	Careful with that VAX Eugene!