=over =item ${^ENCODING} X<${^ENCODING}> This variable is no longer supported. It used to hold the I<object reference> to the C<Encode> object that was used to convert the source code to Unicode. I...

=over =item %^H X<%^H> The C<%^H> hash provides the same scoping semantics as L<C<$^H>|/$^H>. This makes it useful for implementing lexically scoped pragmas. See L<perlpragma>. All the entries are ...

=over =item %ENV X<%ENV> The hash C<%ENV> contains your current environment. Setting a value in C<ENV> changes the environment for any child processes you subsequently C<fork()> off. As of v5.18.0,...

=over =item $PREMATCH =item $` X<$`> X<$PREMATCH> The string preceding whatever was matched by the last successful pattern match. (See L</Scoping Rules of Regex Variables>). See L</Performance issu...

=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 $EXECUTABLE_NAME =item $^X X<$^X> X<$EXECUTABLE_NAME> The name used to execute the current copy of Perl, from C's C<argv[0]> or (where supported) F</proc/self/exe>. Depending on the hos...

=over =item $[ X<$[> This variable stores the index of the first element in an array, and of the first character in a substring. The default is 0, but you could theoretically set it to 1 to make Pe...

=over =item $EXTENDED_OS_ERROR =item $^E X<$^E> X<$EXTENDED_OS_ERROR> Error information specific to the current operating system. At the moment, this differs from C<L</$!>> under only VMS, OS/2, an...

=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. ...