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Shell Script help

Comment:

I have a varable that I need to test to see if it is a numeric or a alpha character. How can I do this? Thanks jrmontg

Name: nails
Date: September 1, 2006 at 08:51:44 Pacific

Reply:

From David Korn, ksh shell inventor. It even handles something like 4.5.4 # which is not numeric #!/bin/ksh isnum() { case $1 in ( ?([-+])+([0-9])?(.)*([0-9])?([Ee]?([-+])+([0-9])) ) return 0;; ( ?([-+])*([0-9])?(.)+([0-9])?([Ee]?([-+])+([0-9])) ) return 0;; *) return 1;; esac } isnum $1 && echo "numeric" || echo "NOT numeric"

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