You are viewing the version of this documentation from Perl blead.
This is the main development branch of Perl.
(git commit 976e22d2a34c45ee8065026229683c7d0c841f46)
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.