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.
!
(not): Reads the stdin and exit number from previous process and not’s it’s conditionand
: Returns true
or false
depending on whether multiple conditions are metconfig
: Query or define Murex runtime settingsor
: Returns true
or false
depending on whether one code-block out of multiple ones supplied is successful or unsuccessful.set
: Define a local variable and set it’s valueThis document was generated from gen/user-guide/bang-prefix_doc.yaml.
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