title: How to write to UNIX terminal through system calls?
body: <p>I have been working on 'C' for quite sometime.</p>
  
  <p>I would like to say 'Hello ' to my team mates when they open the terminal and logon for the first time of the day</p>
  
  <p>I found this post a useful one</p>
  
  <p><a href="https://stackoverflow.com/questions/5202835/not-able-to-read-data-from-other-terminal-using-read-system-call][1]">Not able to read data from other terminal using read() system call</a></p>
  
  <p>How can I write to <strong>others terminal</strong> (because, in pts/n - n will differ from person to person) and say the welcome message ?</p>