clacker
Group: Members
Posts: 570
Joined: June 2004 |
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Posted: May 28 2005,00:28 |
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| Quote (friedgold @ May 06 2005,16:12) | Does any one know how the best way to check if a string is a valid ip address?
[ -z "$(echo "$i" | awk '/^[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}$/')" ]
should check the string is in the form ###.###.###.### where the #'s are nos, but it doesn't rule out stuff like 999.999.999.999. |
Here is a neat way I saw using the cut command to parse out the string:
| Code Sample | #!/bin/bash
# pass the ip string as an argument to this script
if echo $1 | grep -q "^[0-9]*\.[0-9]*\.[0-9]*\.[0-9]*$"
then
for i in 1 2 3 4
do
export dotpart=` echo $1 | cut -f $i -d '.' `
if [ $dotpart -lt 0 -o $dotpart -gt 255 ]
then
echo "ip address was bad"
exit 1
fi
done
echo "ip address was good"
else
echo "ip address was bad"
exit 1
fi
exit 0 |
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