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# 1  
Old 12-20-2006
Help with screen

Hello everyone!

I'm trying to figure out how to send commands from one screen to another.
For example i wish to send a simple "ls -all" from screen #1 to screen #2,
can it be done, and how? Smilie

Thank you!
# 2  
Old 12-20-2006
what is meant by sending commands from one screen to another?
# 3  
Old 12-20-2006
Well this is the deal:
i am in screen #1 and i wish to send a command to screen #2.

The thing is that using screen -x i can have 2 terminals open and monitor 2 screens. I wish to be able to control both screens from either of them.
So if i have two windows open on my desktop, and i work in a window with screen #1, i wish to be able to send commands to a screen #2 that is open in another window on my desktop.

I need this to have several automated processes, for example: feed in screen #1 triggers events in screen #2.
# 4  
Old 12-20-2006
I think you are talking about the screen utility, right?
What I do not know is what you mean when you say "send commands". I can think of two possibilities:
- You want to send commands that run on the other screen (shell). For now, I'm not aware of any way to do this.
- You want to display the o/p of the commands you execute in one screen on the other. In this case, you need to know the terminal asociated to the screen session and redirect the output there:

screen 1                                     screen 2
--------                                     --------
$ tty                                        $ tty
/dev/pts/3                                   /dev/pts/4
$ echo Helo | tee -a /dev/pts/4 
Helo                                         Helo

# 5  
Old 12-20-2006
Thank you for your reply Grial, however this just sends the output from
/dev/pts/3 to /dev/pts/4.

I wish to do the following from /dev/pts/3:

<funcname> /dev/pts/4 echo hello

where <funcname> is the program that enables me to send a command to /dev/pts/4 so the command executes on /dev/pts/4.

Thank you!

Last edited by Gurth; 12-20-2006 at 08:46 AM..
# 6  
Old 12-20-2006
I have been able to come close using "screen" utility.
If i enter the command prompt of the "screen" i can then do:

at 1# "ls -al"

The problem is that i can't get an escape char from the shell. I need to type
ctrl-a-: to get to the command prompt of the screen utility.

Can i perhaps prefix the

at 1# "ls -al"

with some char sequence to emulate the escape char?
# 7  
Old 12-20-2006
What about something like this?

In one screen:
mkfifo namedpipe
export COMMAND=ls
$COMMAND; echo $COMMAND > namedpipe

In the other screen:
while true; do $(cat namedpipe); done &


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