foreach These flow-control keywords are documented in Compound

syswrite FILEHANDLE,SCALAR,LENGTH,OFFSET syswrite FILEHANDLE,SCALAR,LENGTH syswrite FILEHANDLE,SCALAR

abs VALUE abs Returns the absolute value of its argument. If VALUE is omitted, uses

sysseek FILEHANDLE,POSITION,WHENCE Sets FILEHANDLE's system position in bytes using lseek(2). FILEHANDLE may be an expression whose value

fileno FILEHANDLE Returns the file descriptor for a filehandle, or undefined if the filehandle is not open. If there is no real file descriptor

accept NEWSOCKET,GENERICSOCKET Accepts an incoming socket connect, just as accept(2) does. Returns the packed address if it succeeded, false

or These operators are documented in perlop.

getsockopt SOCKET,LEVEL,OPTNAME Queries the option named OPTNAME associated with SOCKET at a given LEVEL. Options may exist at multiple protocol

fork Does a fork(2) system call to create a new process running the same program at the same point. It returns the child pid to the parent

undef EXPR undef Undefines the value of EXPR, which must be an lvalue. Use only on a scalar value, an array