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Dollar-sign expansions

Dollar-sign expansions are definitions of text replacements used in the script or in expressions. This process is known as expansion - even if the new text is shorter. The replacement is made just before the script statement or the expression is evaluated. Technically it is a macro expansion.

The expansion always begins with '$(' and ends with ') ' and the content between brackets defines how the text replacement will be done. To avoid confusion with script macros we will henceforth refer to macro expansions as dollar-sign expansions.

Dollar-sign expansions can be used with any of:

  • variables
  • parameters
  • expressions
Information note A dollar-sign expansion is limited in how many expansions it can calculate. Any expansion over 1000 will not be calculated.

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