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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)
Roll a dice of SIZE. Caveat: rolling a dice more than once in
the same second will give you the same number.
Examples:
Roll a dice of size 6:
$ dice
3
Roll a D20:
$ dice 20
15
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}"
RAND="$(awk 'BEGIN { srand(); print int(rand()*32768) }' /dev/null)"
echo $(((RAND % SIZE) + 1))
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