Update shell_cheatsheet.md

diff --git a/shell_cheatsheet.md b/shell_cheatsheet.md
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@@ -60,6 +60,8 @@ text strings as arguments.
 See the cheatsheet on regular expressions for more "wildcard" shortcuts.
 
 ### b) How to redirect to a file and get input from a file ...
+Redirection operators can be used to redirect the ouput from a program from the display screen to a file where it is saved (or many other places too, like your printer or to another program where it can be used as input).
+
 
 | Command | Description                                                                                                                     |  
 |---------|---------------------------------------------------------------------------------------------------------------------------------|