1 files changed, 53 insertions, 0 deletions
diff --git a/bin/uuid b/bin/uuid
new file mode 100755
index 0000000..74d0fba
--- /dev/null
+++ b/bin/uuid
@@ -0,0 +1,53 @@
+#!/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.
+	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 }'