diff --git a/README.md b/README.md
index 5355586..46ef4c4 100644
--- a/README.md
+++ b/README.md
@@ -112,6 +112,16 @@ grep -f fileA fileB
 grep $'\t' 
 ```
 
+#####grep variable from variable
+```bash
+$echo "$long_str"|grep -q "$short_str"
+if [ $? -eq 0 ]; then echo 'found'; fi
+```
+//grep -q will output 0 if match found
+//remember to add space between []!
+
+
+
 ##Sed
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