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Command Argument Indirection

1990 Version of ANSI Standard

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2.5.8 Command Argument Indirection

Indirection is available for evaluation of either individual command arguments or contiguous sublists of command arguments. The opportunities for indirection are shown in the syntax definitions accompanying the command descriptions.

Typically, where a command word carries an argument list, as in

   COMMANDWORD SP L argument

the argument syntax will be expressed as

    argument::= │
│
│		 individual argument syntax
@ expratom V L argument		 │
│
│

See 2.2 for the definition of expratom. See section 1 for the definition of V. See section 1 for the definition of L. See section 1 for the definition of L.

This formulation expresses the following properties of argument indirection.

  1. Argument indirection may be used recursively.
  2. A single instance of argument indirection may evaluate to one complete argument or to a sublist of complete arguments.

Unless the opposite is explicitly stated, the text of each command specification describes the arguments after all indirection has been evaluated.

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Copyright © Examples: 1995-2025 Ed de Moel;
Copyright © Annotations: 2003-2008 Jacquard Systems Research
Copyright © Annotations: 2008-2025 Ed de Moel.

This page most recently updated on 14-Nov-2023, 21:35:19.

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