COMMENTS
       In a non-interactive shell, or an interactive shell in which the inter‐
       active_comments option to the  shopt  builtin  is  enabled  (see  SHELL
       BUILTIN  COMMANDS  below), 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 interac‐
       tive shells.