Check parameter is number or string Post: 302529949

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Top Forums Shell Programming and Scripting Check parameter is number or string Post 302529949 by alister on Saturday 11th of June 2011 03:02:14 PM

06-11-2011

Registered User

Quote:

Originally Posted by bartus11

Try:

Code:

if [ $(echo $1 | egrep "^[0-9]+$") ]

That's actually a poor solution. Should the value being tested expand to multiple fields, it could lead to syntax errors or other forms of unexpected behavior.

You could quote the command substitution, to ensure that test/[ is only passed a single argument, but, if using grep anyway, I would drop the use of test/[ altogether, redirect the output of egrep to /dev/null (or use the -q option if available), and allow the if statement to use egrep's exit status directly.

---------- Post updated at 03:02 PM ---------- Previous update was at 02:58 PM ----------

A different approach:

Code:

case $1 in
    *[!0-9]*)  echo Error. Not a number.;;
           *)  echo OK. ;;
esac

Regards,
Alister

Last edited by alister; 06-11-2011 at 04:07 PM..

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LEARN ABOUT NETBSD

zfgrep

ZGREP(1)						    BSD General Commands Manual 						  ZGREP(1)

NAME

     zgrep, zegrep, zfgrep -- print lines matching a pattern in gzip-compressed files

SYNOPSIS

     zgrep [grep-flags] [--] pattern [files ...]

     zegrep [grep-flags] [--] pattern [file ...]

     zfgrep [grep-flags] [--] pattern [file ...]

DESCRIPTION

     zgrep runs grep(1) on files or stdin, if no files argument is given, after decompressing them with zcat(1).

     The grep-flags and pattern arguments are passed on to grep(1).  If an -e flag is found in the grep-flags, zgrep will not look for a pattern
     argument.

     zegrep calls egrep(1), while zfgrep calls fgrep(1).

EXIT STATUS

     In case of missing arguments or missing pattern, 1 will be returned, otherwise 0.

SEE ALSO

     egrep(1), fgrep(1), grep(1), gzip(1), zcat(1)

AUTHORS

     Thomas Klausner <wiz@NetBSD.org>

BSD
								 December 28, 2003							       BSD

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