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 3.1.3 Comments
 --------------
 
 In a non-interactive shell, or an interactive shell in which the
 `interactive_comments' option to the `shopt' builtin is enabled (
 The Shopt Builtin), a word beginning with `#' causes that word and
 all remaining characters on that line to be ignored.  An interactive
 shell without the `interactive_comments' option enabled does not allow
 comments.  The `interactive_comments' option is on by default in
 interactive shells.   Interactive Shells, for a description of
 what makes a shell interactive.
 

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