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|
#!/bin/sh
set -eu
usage() {
cat <<-'EOF'
Usage:
uuid
uuid -h
EOF
}
help() {
cat <<-'EOF'
Options:
-h, --help show this message
Generate UUID from /dev/random.
Examples:
Generate a UUID:
$ uuid
755244c8-f955-16df-75cc-f25600c90422
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))
od -xN20 /dev/random |
awk 'NR == 1 { OFS="-"; print $2$3,$4,$5,$6,$7$8$9; exit }'
|
