Path: utzoo!attcan!uunet!husc6!cmcl2!brl-adm!adm!rbj@nav.icst.nbs.gov
From: rbj@nav.icst.nbs.gov (Root Boy Jim)
Newsgroups: comp.unix.questions
Subject: Can you tell if a C-shell variable is numeric?
Message-ID: <16629@brl-adm.ARPA>
Date: 25 Jul 88 18:51:05 GMT
Sender: news@brl-adm.ARPA
Lines: 16

? From: Vijay Sundaram <sundaram@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@icst-cmr.arpa>
	National Bureau of Standards
	Flamer's Hotline: (301) 975-5688
	The opinions expressed are solely my own
	and do not reflect NBS policy or agreement
	Careful with that VAX Eugene!