listen SOCKET,QUEUESIZE Does the same thing that the listen(2) system call does. Returns true if it succeeded, false otherwise. See the example

__PACKAGE__ A special token that returns the name of the package in which it occurs.

warn LIST Prints the value of LIST to STDERR. If the last element of LIST does not end in a newline, it appends the same file/line number

y/// The transliteration operator. Same as tr///

exists EXPR Given an expression that specifies an element of a hash, returns true if the specified element in the hash has ever been initialized

require VERSION require EXPR require Demands a version of Perl specified

unshift ARRAY,LIST unshift EXPR,LIST Does the opposite of a

package NAMESPACE package NAMESPACE VERSION package NAMESPACE BLOCK package

wantarray Returns true if the context of the currently executing subroutine or

qw/STRING/