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

$OUTPUT_AUTOFLUSH

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

$OSNAME

$PID

$LIST_SEPARATOR

${^LAST_FH} This read-only variable contains a reference to the last-read filehandle. This is set by

$EUID

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

$| If set to nonzero, forces a flush right away and after every write or print on the currently selected output channel. Default is 0 (regardless