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(zsh.info)Parameters

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Parameters
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Description
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A parameter has a name, a value, and a number of attributes.  A name
may be any sequence of alphanumeric characters and underscores, or the
single characters `*', `@', `#', `?', `-', `$', or `!'.  The value may
be a _scalar_ (a string), an integer, an array (indexed numerically),
or an _associative_ array (an unordered set of name-value pairs,
indexed by name).  To declare the type of a parameter, or to assign a
scalar or integer value to a parameter, use the typeset builtin.

The value of a scalar or integer parameter may also be assigned by
writing:

     NAME=VALUE

If the integer attribute, -i, is set for NAME, the VALUE is subject to
arithmetic evaluation.  See Note: Array Parameters for additional
forms of assignment.

To refer to the value of a parameter, write `$NAME' or `${NAME}'.  See
Note: Parameter Expansion for complete details.

In the parameter lists that follow, the mark `<S>' indicates that the
parameter is special.  Special parameters cannot have their type
changed, and they stay special even if unset.  `<Z>' indicates that the
parameter does not exist when the shell initializes in sh or ksh
emulation mode.

Array Parameters

Positional Parameters

Local Parameters

Parameters Set By The Shell

Parameters Used By The Shell