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#!/bin/sh -e
# POSIX shell variant for ubase respawn
usage() {
printf 'usage: %s [-d N] cmd [args...]\n' "${0##*/}"
exit "${1:-0}"
}
die() { printf '%s\n' "$@" >&2; exit 1;}
case "$1" in
-d) [ "$3" ] || usage 1
[ "$2" -gt 0 ] || die "Not a number: $2"
delay=$2; shift 2
;;
--help|-h|'') usage ;;
-*) usage 1
esac
while :; do
"$@"
[ "$delay" ] && sleep "$delay"
done
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