$PID

$EVAL_ERROR

$LAST_SUBMATCH_RESULT

IO::Handle->output_field_separator( EXPR )

$REAL_GROUP_ID

$EUID

IO::Handle->format_line_break_characters EXPR

$^M By default, running out of memory is an untrappable, fatal error. However, if suitably built, Perl can use the contents of

$^A The current value of the write() accumulator

$; The subscript separator for multidimensional array emulation. If you refer to a hash element as