You are viewing the version of this documentation from Perl blead.
This is the main development branch of Perl.
(git commit 135abefda8f01c71feb2d24e5415f1d62b2a235a)
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.