GNU Bash Reference Manual by Chet Ramey and Brian Fox Paperback (6"x9"), 180 pages ISBN 0954161777 RRP £19.95 ($29.95) "An essential resource .... the most detailed coverage available for all aspects of Bash" --- Linux User and Developer Magazine (Issue 37, Mar 2004) Get a printed copy>>>

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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 (see section 4.2 Bash Builtin Commands), 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. See section 6.3 Interactive Shells, for a description of what makes a shell interactive.