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    Declare variables and/or give them attributes.  If no NAMEs are
    given, then display the values of variables instead.  The -p option
    will display the attributes and values of each NAME.
    
    The flags are:
    
      -a	to make NAMEs arrays (if supported)
      -f	to select from among function names only
      -F	to display function names (and line number and source file name if
    	debugging) without definitions
      -i	to make NAMEs have the `integer' attribute
      -r	to make NAMEs readonly
      -t	to make NAMEs have the `trace' attribute
      -x	to make NAMEs export
    
    Variables with the integer attribute have arithmetic evaluation (see
    `let') done when the variable is assigned to.
    
    When displaying values of variables, -f displays a function's name
    and definition.  The -F option restricts the display to function
    name only.
    
    Using `+' instead of `-' turns off the given attribute instead.  When
    used in a function, makes NAMEs local, as with the `local' command.