How to "setup" screen using a bash script

Question

I'm trying to write a bash script to create a screen (software) session with a specific set of windows, and cd to specific directories on each one.

Here is the script I have so far:

#!/bin/bash

killall screen;
screen -AmdS work;
screen -S work bash -c "cd myDir";

The problem is that I can't seem to change directories on that session. After running this script, I run $ screen -r and the current directory is still my default directory (~/).

(I've tried changing the cd command to touch myFile and the file is there after I run the script)

If you try bash -c "cd myDir" in your terminal, you'll see that it doesn't change directories. Use the screen command (not shell command) chdir to change directories, then open a new shell and it will start in that directory — that other guy
– that other guy, Commented Dec 9, 2016 at 20:44
Well -- it changes directories, but it changes the directory of the new shell you started with the bash command, not the directory of the shell/program that ran it. And since that new shell is exiting as soon as it finishes running the script it was passed with bash -c... — Charles Duffy
– Charles Duffy, Commented Dec 9, 2016 at 20:55

martin.macko.47 · Accepted Answer · 2016-12-09 21:26:42Z

8

Try the following, it will open a new screen session with a bash which will change the directory and open a new bash with this directory as current:

screen -S work bash -c 'cd myDir && exec bash'

Adding -d -m to run it in detached mode. And after reattaching you will be in myDir:

screen -S work -d -m bash -c 'cd myDir && exec bash'

Better solution

The following code will create a detached screen with 3 screens each running myCommand1/2/3 in directory myDir1/2/3.

cd myDir1
screen -S work -d -m
screen -S work -X exec myCommand1
screen -S work -X chdir myDir2
screen -S work -X screen
screen -S work -X exec myCommand2
screen -S work -X chdir myDir3
screen -S work -X screen
screen -S work -X exec myCommand3
cd -

Note the last cd - that will return you back to your original working directory.

Finally just use screen -r work to attach your running screen session.

edited Dec 9, 2016 at 21:26

answered Dec 9, 2016 at 20:52

martin.macko.47

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2 Comments

Charles Duffy Over a year ago

cd mydir && exec bash avoids leaving the parent process sitting in memory

martin.macko.47 Over a year ago

@CharlesDuffy even better, thanks.. i'll update the answer with exec

choroba · Accepted Answer · 2016-12-09 20:59:12Z

2

You can save the command line you want to run (including the final newline) into a register and paste it into the screen input:

screen -S work -X register c $'cd myDir\n'
screen -S work -X paste c

answered Dec 9, 2016 at 20:59

choroba

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