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Stand-alone expressions

Actions may include stand-alone expressions, that is expressions without an assignment or if() clause. A stand-alone expression can’t change any attributes but a few expressions have useful side-effects, including use of the runCommand, linkTo, linkFrom, unlinkTo, and unlinkFrom operators.

Often, the output from these operators is of no practical use and this saves the need for adding a user attribute simply to run this type of operator.

The action() function makes it easier to execute standalone code expressions.

A Tinderbox Reference File : Actions & Rules : Stand-alone expressions