Added one_liners

bash/README.md

@@ -6,6 +6,10 @@ https://devhints.io/bash
 https://sharats.me/posts/shell-script-best-practices/ - awesome template of Good Things (TM) ...  
 ... which then leads to https://news.ycombinator.com/item?id=33354286 - I need to read and consume this properly, so many interesting tool and usage suggestions.
 
+## one_liners.bash
+
+Collection of simple tricks not big enough to need a separate file.
+
 ## argument_parsing.bash
 
 Handling command line argument / parameter parsing at the beginning of a script.