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Library: GNU bash Command Reference (Darwin 9.0)

declare

declare: declare [-afFirtx] [-p] [name[=value] ...]

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.

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