GNU Rush – a restricted user shell (split by node):   Section:   Chapter:FastBack: Configuration File   Up: Global   FastForward: Default Configuration   Contents: Table of ContentsIndex: Concept Index

4.3.1 Expansion control

The following statement controls the behavior of rush when an undefined variable is expanded (see Variable expansion).

global: expand-undefined bool

If bool is ‘true’, expand undefined variables to empty value. If it is ‘false’ (the default), issue an error and abort.

The following values can be used as synonyms for ‘true’: ‘yes’, ‘on’, ‘t’, ‘1’.

The following values can be used as synonyms for ‘false’: ‘no’, ‘off’, ‘nil’, ‘0’.

See handling of undefined variables, for a detailed discussion of how rush processes undefined variables and for the recommended techniques of handling them.

This document was generated on January 2, 2022 using makeinfo.

Verbatim copying and distribution of this entire article is permitted in any medium, provided this notice is preserved.