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Full Discussion: Checking input is Numerical
Top Forums Shell Programming and Scripting Checking input is Numerical Post 302387848 by ahmad.diab on Monday 18th of January 2010 02:29:49 PM
Old 01-18-2010
if you had searched the forum you could find the script below by Franklin which is better than the above one:-


Code:
#!/bin/bash

shopt -s extglob

INPUT="123"

case $INPUT in
   ( +([[:digit:]])  ) echo "$INPUT is all numbers" ;;
   ( +([[:alpha:]])  ) echo "$INPUT is all characters" ;;
   ( +([[:alnum:]])  ) echo "$INPUT is alphanumeric" ;;
   (                *) echo "$INPUT is empty or something unknown" ;;
esac

exit 0

for the tr -d & if [ -z ]..
just see your system manual using below.

Code:
man if
man tr

 

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