send

send 
socket
, 
msg
, 
flags
, [
dest
]

Sends a message msg on a socket. It takes the same flags as the system call of the same name - see send(2) . On unconnected sockets you must specify a destination dest to send to, in which case send works like sendto(2) . The function returns the number of bytes sent, or the undefined value if there is an error. On error, it puts the error code into $! .

(Some non-Unix systems improperly treat sockets as different objects than ordinary file descriptors, with the result that you must always use send and recv on sockets rather than the standard I/O operators.)