You are viewing the version of this documentation from Perl blead.
This is the main development branch of Perl.
(git commit 6aef1e87c1ea274e225828cbc1a6044b54feec44)
The special filehandle that points to the currently open output file when doing edit-in-place processing with -i. Useful when you have to do a lot of inserting and don't want to keep modifying $_. See perlrun for the -i switch.