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Bash Reference Manual

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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.


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