write - it creates a communication line between two logged-in users through the terminal

syntax $ write <user> <tty name>

To write a message to user2 from user1 $ write user2 this is test message ^D

To pipe a message to write $ echo "Hello from user1" | write user2

To write a message from file $ cat msg.txt this is test msg

$ write user2 < msg.txt

To write to specified tty $ write user2 pts/0

regards, T.Dhanasekar