Derek Ragona wrote:
At 12:04 PM 8/18/2007, Christer Hermansson wrote:
I also found some basic example at :



echo "Type in a number"
read ans
number=`expr "$ans" : "([0-9]*)"`
if [ "$number" != "$ans" ]; then
echo "Not a number"
elif [ "$number" -eq 0 ]; then
echo "Nothing was typed"
echo "$number is a fine number"


The above example doesn't work on my freebsd box. Maybe I need to update my system, sitting with 6.0R which never been updated.

You have a syntax error using expr. Do a man on expr for more details but if you change that line from:
number=`expr "$ans" : "([0-9]*)"`
number=`expr "$ans" : "\([0-9]*\)"`

You will get the desired results.

Also when debugging scripts remember to add:
set -x
to your script on the second line, and see what the script lines are actually doing.


Thanks Derek ! Now both the example and my own code works for me. I changed my code from "^[A-Za-z0-9_-]+$" to "\([A-Za-z0-9_-]*\)" It seems that FreeBSD's expr want some different syntax than the webbased test tool at


Christer Hermansson

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