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|
#!/bin/sh
set -eu
usage() {
cat <<-'EOF'
Usage:
dice [SIZE]
dice -h
EOF
}
help() {
cat <<-'EOF'
Options:
-h, --help show this message
SIZE the size of the dice (default: 6)
Examples:
Roll a dice of size 6:
$ dice
Roll a D20:
$ dice 20
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 $((OPTIND - 1))
SIZE="${1:-6}"
echo $(((RANDOM % SIZE) + 1))
|
