Add 'grep . *' oneliner trick for high-level scan of a directory

README.md

@@ -238,6 +238,12 @@ A few examples of piecing together commands:
       cat a b b | sort | uniq -u > c   # c is set difference a - b
 ```
 
+- Use `grep . *` to visually examine all contents of all files in a directory.  Useful for directories filled with config settings, like /sys /proc /etc.
+```sh
+      cd /proc/sys/net/ipv4
+      grep . *
+```
+
 - Summing all numbers in the third column of a text file (this is probably 3X faster and 3X less code than equivalent Python):
 ```sh
       awk '{ x += $3 } END { print x }' myfile