Bash and testing a variable

[Gordon]

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:

read var
if [ "$var" is a number ]; then
do something
else
echo var is not a number
fi



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