If I understood correctly, you may be able to do that using pexpect and the interact method. import struct, fcntl, termios, signal, sys def sigwinch_p

If I understood correctly, you may be able to do that using pexpect and the interact method. import struct, fcntl, termios, signal, sys def sigwinch_passthrough (sig, data): s = struct.pack("HHHH", 0, 0, 0, 0) a = struct.unpack('hhhh', fcntl.ioctl(sys.stdout.fileno(), termios.TIOCGWINSZ , s)) if not child.closed: child.setwinsize(a[0],a[1]) child = pexpect.spawnu("sh", args, encoding='utf-8', logfile=sys.stdout) signal.signal(signal.SIGWINCH, sigwinch_passthrough) child.expect_exact("...") child.logfile = None # Otherwise, interact raises an Exception child.send("...\n") child.interact()