ell function frencrion is executed in the current shell environment. When it fin- ishes, the possible completions are retrieved from the value of the COMPREPLY array variable. —X filterpat filterpat is a pattern as used for filename expansion. It is applied to the list of possible completions generated b

scribed below (see Section 8.7 [Programmable Completion Builtins], page 109), to generate the matches. It must put the possible comple- tions in the COMPREPLY array variable. Next, any command specified with the `-C' option is invoked in an environment equivalent to command substitution. It should print a