vec Binary test or set particular bits in a string
wait Process wait for any child process to die
waitpid Process wait for a particular child process to die
-wantarray Misc,Flow get list vs array context of current subroutine call
+wantarray Misc,Flow get void vs scalar vs list context of current subroutine call
warn I/O print debugging info
write I/O print a picture record
y/// String transliterate a string