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is_number(1) can be used in shell scripts to determine if a variable is all numeric.
If expr(1) exists on your system, expr(1) can be used to validate if a string us all numeric.
Compile Instructions are in the README File inside the tarball.
$Id: is_number.gmi,v 1.5 2023/12/05 15:23:20 jmccue Exp $