On Tue, 2003-02-11 at 16:07, Gordon wrote:
> I've searched all over for an answer to this and haven't found one yet!
>
> Is there a way in a bash script to test if a variable contains an
> integer? I want to create a script that uses some simple arithmetic but
> bash bombs out if you try to do a comparison or arithmetic with a
> non-numeric value. Basically, something like:
# note that weird things will happen if z is a multi-line variable
if echo "$z" | grep "^[0-9][0-9]*$" >/dev/null ; then
echo z is a non-negative integer
else
echo bad input ; exit 1
fi
or
if echo "$z" | grep "^[1-9][0-9]*$" >/dev/null ; then
echo z is an integer greater than zero, no leading zeroes
else
echo bad input ; exit 1
fi
you could probably do it in pure bash if necessary by using the builtin
arithmetic operators, but grep is best for portability.
hth,
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