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#!/bin/sh
set -eu
usage() {
cat <<-'EOF'
Usage:
max NUMBER...
max -h
EOF
}
help() {
cat <<-'EOF'
Options:
-h, --help show this message
NUMBER the list of numbers to get the max from
Get the maximum number from the given values.
Examples:
Get the maximum number from a list:
$ min 5 3 9 9 4
9
Get the maximum number when negative numbers are given
$ max -- -3 -5
-3
Get the maximum number given a single number
$ max 8
8
The maximum default number:
$ max
0
EOF
}
for flag in "$@"; do
case "$flag" in
(--)
break
;;
(--help)
usage
help
exit
;;
(*)
;;
esac
done
while getopts 'h' flag; do
case "$flag" in
(h)
usage
help
exit
;;
(*)
usage >&2
exit 2
;;
esac
done
shift $((OPTIND - 1))
if [ -z "${1:-}" ]; then
echo 0
exit
fi
N="$1"
for n in "$@"; do
N=$((N > n ? N : n))
done
printf '%s\n' "$N"
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