=over =item $# X<$#> C<$#> was a variable that could be used to format printed numbers. After a deprecation cycle, its magic was removed in Perl v5.10.0 and using it now triggers a warning: C<$# is...

=over =item IO::Handle->output_field_separator( EXPR ) =item $OUTPUT_FIELD_SEPARATOR =item $OFS =item $, X<$,> X<$OFS> X<$OUTPUT_FIELD_SEPARATOR> The output field separator for the print operator. ...

=over =item ${^UNICODE} X<${^UNICODE}> Reflects certain Unicode settings of Perl. See L<perlrun|perlrun/-C [numberE<sol>list]> documentation for the C<-C> switch for more information about the poss...

=over =item ${^RE_DEBUG_FLAGS} X<${^RE_DEBUG_FLAGS}> The current value of the regex debugging flags. Set to 0 for no debug output even when the C<re 'debug'> module is loaded. See L<re> for details...

=over =item @ARGV X<@ARGV> The array C<@ARGV> contains the command-line arguments intended for the script. C<$#ARGV> is generally the number of arguments minus one, because C<$ARGV[0]> is the first...

=over =item ${^WIN32_SLOPPY_STAT} X<${^WIN32_SLOPPY_STAT}> X<sitecustomize> X<sitecustomize.pl> This variable no longer has any function. This variable was added in Perl v5.10.0 and removed in Perl...

=over =item $BASETIME =item $^T X<$^T> X<$BASETIME> The time at which the program began running, in seconds since the epoch (beginning of 1970). The values returned by the B<-M>, B<-A>, and B<-C> f...

=over =item @ARG =item @_ X<@_> X<@ARG> Within a subroutine the array C<@_> contains the parameters passed to that subroutine. Inside a subroutine, C<@_> is the default array for the array operator...

=over =item HANDLE->format_lines_left(EXPR) =item $FORMAT_LINES_LEFT =item $- X<$-> X<$FORMAT_LINES_LEFT> The number of lines left on the page of the currently selected output channel. Mnemonic: li...

=over =item $ARGV X<$ARGV> Contains the name of the current file when reading from C<< <> >>. =back