From 600f31775ad1dada4b59ab9637e532ac17cdc9ca Mon Sep 17 00:00:00 2001
From: Eric Teunis de Boone <ericteunis@deboone.nl>
Date: Thu, 7 Jan 2021 15:58:53 +0100
Subject: [PATCH] [bin] added dotrev utility

---
 bin/dotrev | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100755 bin/dotrev

diff --git a/bin/dotrev b/bin/dotrev
new file mode 100755
index 0000000..e381165
--- /dev/null
+++ b/bin/dotrev
@@ -0,0 +1,23 @@
+#!/bin/bash
+
+# dotrev
+# Reverse the order of substrings within a dotted string.
+# Example: deboone.nl -> nl.deboone
+
+while [ -n "$1" ]; do
+	tmp="$1"
+	REVHOSTNAME=""
+	while [ -n "$tmp" ]; do
+	    piece="${tmp##*.}."
+	    tmp="${tmp%.*}"
+	    REVHOSTNAME="${REVHOSTNAME}${piece}"
+	    if ! case "$tmp" in *.*) ;; *) false;; esac; then
+	        REVHOSTNAME="${REVHOSTNAME}${tmp}"
+	        unset tmp
+	        unset piece
+	        break;
+	    fi
+	done
+	echo $REVHOSTNAME
+	shift
+done