You are viewing the version of this documentation from Perl blead. This is the main development branch of Perl. (git commit bf1aacf4f755a25863a69417c5214aac7693b1c8)
$WARNING
$^W

The current value of the warning switch, initially true if -w was used, false otherwise, but directly modifiable.

See also warnings.

Mnemonic: related to the -w switch.