Answers for "shell how to check if variable is number"

bash if is number

re='^[0-9]+$'
if ! [[ $yournumber =~ $re ]] ; then
   echo "error: Not a number" >&2; exit 1
fi

Posted by: Guest on May-24-2021

check if variable is a number in bash

re='^[0-9]+$'
if ! [[ $yournumber =~ $re ]] ; then
   echo "error: Not a number" >&2; exit 1
fi

Posted by: Guest on April-15-2020

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