diff --git a/commandline.md b/commandline.md
index ccd04eb..ad984c0 100644
--- a/commandline.md
+++ b/commandline.md
@@ -91,4 +91,7 @@ To install a program from source on a shared cluster, you will often need to spe
 ```
 ./configure --prefix=/projects/ps-yeolab/software
 make && make install   # "make install" will run only if "make" is successful
-```
+``
+
+Awk lets you do a lot of things
+awk 'pattern{action}' file