Restricted User Shell
The following statement controls the behavior of
an undefined variable is expanded (see Variable expansion).
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
rush processes undefined variables and for the
recommended techniques of handling them.
This document was generated on July 12, 2019 using makeinfo.Verbatim copying and distribution of this entire article is permitted in any medium, provided this notice is preserved.