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| Usage: eval ''variable'' = ''expression''
| | == Synopsis == |
| show ''variable'' ...
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| set ''variable'' ...
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| set ''variable'' = ''value''
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| unset ''variable'' ...
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| ''variable'' = ''expression''
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| ''variable'' := ''expression''
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| external ''variable'' = ''expression''
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| external ''variable'' := ''expression''
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| The "eval" statement evaluates the Fortran-77 ''expression'' and assigns the
| | '''unset''' ''variable'' ... |
| result to the ''variable''.
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| The statement "show" without parameters lists the names and values of all
| | == Description == |
| global variables that do not have the value "NULL"; with parameters, "show"
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| lists the names and values of the given variables. Global variables that are
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| hidden by a local variable with the same name are identified by the attribute
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| "hidden".
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| The statement "set" without parameters lists the names and values of all
| | removes one or more variables. |
| variables that do not have the value "NULL"; with parameters, "set" lists
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| the names and values of the given variables. In contrast to "show", local
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| variables are listed too. | |
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| "set ''variable'' = ''value''" gives the variable ''variable'' the string value
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| ''value''.
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| The statement "unset" the given variables. System variables cannot be unset.
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| "''variable'' = ''expression''" and "''variable'' := ''expression''" are shorthand
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| notations for "eval ''variable'' = ''expression''" and "set ''variable'' =
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| ''expression''", respectively.
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| "external ''variable'' := ''value''" or "external ''variable'' = ''value''" assign
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| a value (i. e. a string) or the result of an expression to an external
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| (non-local) variable even if a local variable with the same name exists.
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| This command can be used to return values from a macro to the calling macro.
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Synopsis
unset variable ...
Description
removes one or more variables.