bash check if variable is a number
# bash check if $1 is an integer
# compact version:
[ -n "$1" ] && echo "\$1 : is EMPTY" && exit 1
[ "$1" -eq "$1" ] 2>/dev/null && echo "$1 : is a number" || echo "$1 : not a number"
# long version
if [ "$1" -eq "$1" ] 2>/dev/null; then
echo "$1 : is a number"
else
[ -n "$1" ] && echo "$1 : is EMPTY" && exit 1
echo "$1 : not a number"
ficheck if variable is a number in bash
re='^[0-9]+$'
if ! [[ $yournumber =~ $re ]] ; then
echo "error: Not a number" >&2; exit 1
fiCopyright © 2021 Codeinu
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