tty

What it does

How to write it

tty [OPTION]...

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$ run as a normal user# run as root (or with sudo)

1. 1Which terminal am I on?

   $tty
   /dev/pts/0

   pts = terminal window or SSH session.

2. 2On the local text console

   $tty
   /dev/tty3

   A real virtual console (Ctrl+Alt+F3).

3. 3Check in a script if a person is watching

   $if tty -s; then echo "interactive"; else echo "batch (cron, pipe)"; fi

   Ask questions only when a person can answer.

4. 4In a pipe there is no terminal

   $echo | tty
   not a tty

   stdin comes from the pipe, not from a terminal.

5. 5Send a message to another session

   $who
   $write admin pts/1

   write and wall use the terminal names that tty and who show.

6. 6End another session

   #pkill -KILL -t pts/3

   Logs out the session on pts/3 (find it with who).

7. 7Set terminal options for your session

   $stty -a

   Shows the settings of the current tty (like the erase key).

8. 8Log the terminal in a script

   $echo "$(date) started on $(tty) by $USER" >> /var/tmp/run.log

   Helps to see later how and where a script was run.

9. 9See the owner of your terminal device

   $ls -l $(tty)
   crw--w----. 1 admin tty 136, 0 Oct 25 09:02 /dev/pts/0

   Your terminal belongs to you; group tty may write messages to it.

10. 10Find processes attached to a terminal

    $ps -t pts/0

    All processes of that session.

11. 11Check that SSH gave you a terminal

    $ssh server2 tty; ssh -t server2 tty

    Without -t a remote command has no terminal ("not a tty").

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