Nicer awk

diff --git a/ch13/Makefile b/ch13/Makefile
index 6e7c3e4..7f95a8b 100644 (file)
--- a/ch13/Makefile
+++ b/ch13/Makefile
@@ -14,7 +14,7 @@ stop:
 # Delete images
 clean:
        docker ps -a | awk 'NR!=1 { print $1 }' | xargs docker rm
-       docker images | awk 'NR>1' | awk '/ch13.*/ {print $1":"$2}' | xargs docker rmi
+       docker images | awk 'NR>1 && /ch13.*/ {print $1":"$2}' | xargs docker rmi
 
 # Generate self-signed certs for localhost
 ssl: certs/nginx.crt certs/nginx.key