You are viewing the version of this documentation from Perl blead.
This is the main development branch of Perl.
(git commit 4e98a48cc732fda7eebc13e9aece45ad5144186d)
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.