=over =item $PROGRAM_NAME =item $0 X<$0> X<$PROGRAM_NAME> Contains the name of the program being executed. On some (but not all) operating systems assigning to C<$0> modifies the argument area that...

=over =item @LAST_MATCH_START =item @- X<@-> X<@LAST_MATCH_START> This array holds the offsets of the beginnings of the last successful match and any capture buffers it contains. (See L</Scoping Ru...

=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 ${^CHILD_ERROR_NATIVE} X<$^CHILD_ERROR_NATIVE> The native status returned by the last pipe close, backtick (C<``>) command, successful call to C<wait()> or C<waitpid()>, or from the C<s...

=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 ${^RE_DEBUG_FLAGS} X<${^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 $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 %{^HOOK} X<%{^HOOK}> This hash contains coderefs which are called when various perl keywords which are hard or impossible to wrap are called. The keys of this hash are named after the k...