The io::capture module defines an abstract base class that can be used to build modules that capture output being sent on a filehandle such as stdout or stderr.

several modules that come with the distribution do just that. i.e., capture stdout and stderr. also see james keenan's io::capture::stdout::extended on cpan.

see io::capture::overview for a discussion of these modules and examples of how to build a module to sub-class from io::capture yourself. if after reading the overview, you would like to build a class from io::capture, look here for details on the internals.