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| -rw-r--r-- | source/rainerscript/functions/rs-exists.rst | 30 |
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diff --git a/source/rainerscript/functions/rs-exists.rst b/source/rainerscript/functions/rs-exists.rst new file mode 100644 index 0000000..eabffd8 --- /dev/null +++ b/source/rainerscript/functions/rs-exists.rst @@ -0,0 +1,30 @@ +******** +exists() +******** + +Purpose +======= + +exists($!path!varname) + +This function checks if the specified variable exists, in other +words: contains a value. A variable that once was set and later +on unset does also not exist. + +The function accepts a single argument, which needs to be a variable. +It returns 0 if the variable does not exist and 1 otherwise. The +function can be combined with any other expression to form more +complec expressions. + +.. versionadded:: 8.2010.10 + + +Example +======= + +.. code-block:: none + + if exists(!$path!varname) then ... + if not exists($.local!var) then ... + if exists($!triggervar) and $msg contains "something" then ... + |