# write > Write a message on the terminal of a specified logged in user (ctrl-C to stop writing messages). > To find out all terminal_ids of all users active on the system see the 'who' command. - Send a message to user {{username}} on terminal {{terminal_id}}: `write {{username}} {{terminal_id}}` - Send message to user 'testuser' on terminal /dev/tty/5: `write {{testuser}} {{tty/5}}` - Send message to user 'jhondoe' on pseudo terminal /dev/pts/5: `write {{jhondoe}} {{pts/5}}`