murex Shell Docs

User Guide: Bang Prefix

Bang prefixing to reverse default actions

Some builtins support a bang prefix, !, which provides a shorthand negative action to default behavior. For example, set defines a variable where as !set will undefine a variable.

Sometimes the shortcut will be logical, like a not operator, as is the case with and where typically each result has to equal true normally or false if used in !and. Sometimes the shortcut will be more philosophical, such as with config where normal operations is to query or set configuration but !config resets the configuration to defaults (thus operating the same as config default).

Please read the respecting commands doc for details on whether it supports a bang prefix and what the behavior of that prefix is.

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