Hi, Thanks for the reply. Actually for the client program, I did use print to send username and password to the server first for authentication before receiving the file. Will it help if I change print to syswrite instead? I did try before but it doesn't work too. 
Updated Client program:

create_socket #function to establish connection with server

print $sock, <username>;
sleep(1);  #to allow a pause so that username and pwd are 2 streams
print $sock <pwd>;

while($len = sysread($sock, $buffer, 500000000))
{

createFile("<filename>", $buffer, $len, 0);
        
#processFile;
}

[download]

In reply to Re^2: sysread and syswrite in tcp sockets by rustybar
in thread sysread and syswrite in tcp sockets by rustybar

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