@- $-[0] is the offset of the start of the last successful match

$b Special package variables when using sort()

%ERRNO

@+ This array holds the offsets of the ends of the last successful submatches in the currently active dynamic scope.

$[ 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

%^H The %^H hash provides the same scoping semantic as

$^ The name of the current top-of-page format for the currently selected output channel. The default is the name of the filehandle with

$EFFECTIVE_USER_ID

HANDLE->autoflush( EXPR )

$OUTPUT_AUTOFLUSH