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Top Forums Shell Programming and Scripting check input = "empty" and "numeric" Post 302150856 by Smiling Dragon on Wednesday 12th of December 2007 10:38:28 PM
Old 12-12-2007
If you want to be sure the entire argument is numeric (rather than just the first character), use grep:
Code:
if echo $VAR | grep [^0-9] > /dev/null
then
  echo "Some non-numeric characters detected"
else
  echo "All numeric"
fi

 

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ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME
zgrep - search possibly compressed files for a regular expression SYNOPSIS
zgrep [ grep_options ] [ -e ] pattern filename... DESCRIPTION
Zgrep invokes grep on compressed or gzipped files. These grep options will cause zgrep to terminate with an error code: (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*). All other options specified are passed directly to grep. If no file is specified, then the standard input is decompressed if necessary and fed to grep. Otherwise the given files are uncompressed if necessary and fed to grep. If the GREP environment variable is set, zgrep uses it as the grep program to be invoked. EXIT CODE
2 - An option that is not supported was specified. AUTHOR
Charles Levert (charles@comm.polymtl.ca) SEE ALSO
grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1) ZGREP(1)
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