From 0a841546d9d96e49be516e82fbb71174ac92426f Mon Sep 17 00:00:00 2001
From: Babak Farrokhi <babak@farrokhi.net>
Date: Sat, 6 Aug 2016 12:14:38 +0430
Subject: [PATCH] Improve condition checks

---
 multiping_ | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/multiping_ b/multiping_
index 4e6aaf6..f62ef32 100755
--- a/multiping_
+++ b/multiping_
@@ -48,7 +48,7 @@ IPS=`ifconfig ${interface} | awk '/inet /{print $2}' | grep -Ev '^(10|192)\.'`
 
 if [ $# -lt 1 ]; then
 
-	if [ "x${SRC}" == "x" ]; then
+	if [ -z ${SRC} ]; then
 		echo "should run from symlink"
 		exit 1
 	fi
@@ -80,12 +80,12 @@ elif [ "$1" == "suggest" ]; then
 
 elif [ "$1" == "autoconf" ]; then
 
-	if [ "x${hosts}" == "x" ]; then
+	if [ -z ${hosts} ]; then
 		echo "no (env.hosts is not defined)"
 		exit 1
 	fi
 
-	if [ "x${interface}" == "x" ]; then
+	if [ -z ${interface} ]; then
 		echo "no (env.interface is not defined)"
 		exit 1
 	fi
@@ -96,7 +96,7 @@ elif [ "$1" == "autoconf" ]; then
 
 elif [ "$1" == "config" ]; then
 
-	if [ "x${SRC}" == "x" ]; then
+	if [ -z ${SRC} ]; then
 		exit 1
 	fi