Use the tty command in each terminal to identify them:

$ tty
/dev/pts/0

$ tty
/dev/pts/1

Assuming these TTYs, to redirect the first's stdout to the second, run this in the first terminal:

exec 1>/dev/pts1

To restore its stdout:

exec 1>/dev/pts0

See this video for a demonstration.

Use the tty command in each terminal to identify them:

$ tty
/dev/pts/0

$ tty
/dev/pts/1

Assuming these TTYs, to redirect the first's stdout to the second, run this in the first terminal:

exec 1>/dev/pts/1

Note: Now every command output will show on pts/1

To restore default behavior stdout of pts/0:

exec 1>/dev/pts/0

See this video for a demonstration.

Aloha!

1. Open two terminals;
2. Identifying each terminal with tty command;
3. Supposing they identified with /dev/pts/0 and /dev/pts/1;
4. In terminal pts/0 redirecting stdout to pts/1 with exec command: exec 1>/dev/pts/1
5. Now every command stdout output from pts/0 terminal is displaying in pts/1;
6. Redirecting back stdout with commad: exec 1>/dev/pts/0
7. Now pts/0 stdout working as before.

##[YouTuBee]:It's better to see once, than hear seven times Note: Click on image to open video on YouToBee

Use the tty command in each terminal to identify them:

$ tty
/dev/pts/0

$ tty
/dev/pts/1

Assuming these TTYs, to redirect the first's stdout to the second, run this in the first terminal:

exec 1>/dev/pts1

To restore its stdout:

exec 1>/dev/pts0

See this video for a demonstration.