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Re: process result code in if
From: |
Eric Blake |
Subject: |
Re: process result code in if |
Date: |
Thu, 6 Jun 2013 08:41:23 -0400 (EDT) |
----- Original Message -----
>
> A more robust, (and more portable), formulation may be:
>
> echo $var | grep '^+\{0,1\}[0-9]\{1,\}$' > /dev/null 2>&1
Why fork, when straight shell will do?
case $var in
+*) tmp=$var ;;
*) tmp=+$var ;;
esac
case $tmp in
+*[!0-9]* | +) echo "not numeric" ;;
*) echo integer ;;
esac
Again, when placing this in autoconf.ac, you need to quote the
[0-9] since m4 eats one level of [], either by writing [[0-9]]
in place, or by using [] around the entire case snippet.
--
Eric Blake address@hidden +1-919-301-3266
Libvirt virtualization library http://libvirt.org
Re: process result code in if, Miles Bader, 2013/06/06
- Re: process result code in if, Gary V. Vaughan, 2013/06/06
- Re: process result code in if, Miles Bader, 2013/06/06
- Re: process result code in if, A.P. Horst, 2013/06/07
- Re: process result code in if, Miles Bader, 2013/06/07
- Re: process result code in if, Tim Rice, 2013/06/07
- Re: process result code in if, Miles Bader, 2013/06/07