docker-purge handles the cases

- no images to remove
- no containers
- running containers
gracefully now

Author: slaxor

docker-ip

@@ -11,3 +11,4 @@ fi
 
 # return the ip address of the last created container
 docker inspect --format {{.NetworkSettings.IPAddress}} ${1}
+

docker-ip-last

@@ -2,3 +2,4 @@
 
 # return the ip address of the last created container
 docker inspect --format {{.NetworkSettings.IPAddress}} $(docker ps -l -q)
+

docker-last

@@ -2,3 +2,4 @@
 
 # return the id of the last created container
 docker ps -l -q
+

docker-purge

@@ -8,21 +8,39 @@ usage () {
 	echo "  help       - prints this message"
 }
 
+remove_containers () {
+	CONTAINERS=$(docker ps -a|awk '/Exited /{printf("%s ", $1)}')
+	if [[ -z $CONTAINERS ]]  ; then
+		echo "no inactive containers found"
+	else
+		docker rm $CONTAINERS
+	fi
+}
+
+remove_images () {
+	IMAGES=$(docker images | grep none | awk '{print $3}' | sort -r)
+	if [[ -z $IMAGES ]]  ; then
+		echo "no unused images found"
+	else
+		docker rmi $IMAGES
+	fi
+}
+
 if [ $# -ne 1 ]; then
 	usage
 	exit 1
 fi
 
 case $1 in
 	containers)
-		docker rm $(docker ps -a -q)
+		remove_containers
 		;;
 	images)
-		docker rmi $(docker images | grep none | awk '{print $3}' | sort -r)
+		remove_images
 		;;
 	all)
-		docker rm $(docker ps -a -q)
-		docker rmi $(docker images | grep none | awk '{print $3}' | sort -r)
+		remove_containers
+		remove_images
 		;;
 	help)
 		usage