Update shell_and_terminal.md

laurelmcintyre · web-flow · commit 680cc759f6da · 2017-07-31T13:02:54.000-06:00
diff --git a/shell_and_terminal.md b/shell_and_terminal.md
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 ### The Shell and Terminal
-The shell is a program used on the command-line interface (on Terminal) to read commands and run other programs. The command line on Terminal starts with the name of the computer followed by the name of the user. Type commands after the prompt ($). 
+The shell is a program used on the command-line interface (on Terminal) to read commands and run other programs. The command line on Terminal starts with the name of the computer followed by the name of the user. Type commands after the prompt ($) (for Linux). 
 
 [Software Carpentry tutorial on the shell](http://swcarpentry.github.io/shell-novice/)
 
