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   bash    ( 1 )

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RESERVED WORDS

Reserved words are words that have a special meaning to the
       shell.  The following words are recognized as reserved when
       unquoted and either the first word of a command (see SHELL
       GRAMMAR below), the third word of a case or select command (only
       in is valid), or the third word of a for command (only in and do
       are valid):

       ! case  coproc  do done elif else esac fi for function if in
       select then until while { } time [[ ]]