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