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Top Forums UNIX for Dummies Questions & Answers Basic number checking problem Post 302354964 by chebarbudo on Monday 21st of September 2009 05:14:10 AM
Old 09-21-2009
Hi ChrisHoogie,

grep will make it much easier!
Code:
read input
if egrep -q '^[0-9]{1,3}$' <<< "$input"; then
    your command here
else
    echo error
fi



---------- Post updated at 11:14 ---------- Previous update was at 11:09 ----------

Hi funksen,
Watch for your command, it will still accept the following inputs:
1 e24
abc 123
 

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XZGREP(1)							     XZ Utils								 XZGREP(1)

NAME
xzgrep - search compressed files for a regular expression SYNOPSIS
xzgrep [grep_options] [-e] pattern file... xzegrep ... xzfgrep ... lzgrep ... lzegrep ... lzfgrep ... DESCRIPTION
xzgrep invokes grep(1) on files which may be either uncompressed or compressed with xz(1), lzma(1), gzip(1), bzip2(1), or lzop(1). All options specified are passed directly to grep(1). If no file is specified, then standard input is decompressed if necessary and fed to grep(1). When reading from standard input, gzip(1), bzip2(1), and lzop(1) compressed files are not supported. If xzgrep is invoked as xzegrep or xzfgrep then egrep(1) or fgrep(1) is used instead of grep(1). The same applies to names lzgrep, lze- grep, and lzfgrep, which are provided for backward compatibility with LZMA Utils. ENVIRONMENT
GREP If the GREP environment variable is set, xzgrep uses it instead of grep(1), egrep(1), or fgrep(1). SEE ALSO
grep(1), xz(1), gzip(1), bzip2(1), lzop(1), zgrep(1) Tukaani 2011-03-19 XZGREP(1)
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