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#!/bin/sh
# is-int.sh
# =========
# Usage: is-int.sh ITEM
#
# Check if an item is an integer.
err_msg() {
(>&2 echo "$1")
exit 1
}
if [ $# -lt 1 ]; then
err_msg "Usage: is-int.sh ITEM"
fi
[ "$1" -eq "$1" ] 2> /dev/null && exit 0 || exit 1