How can I get screen to execute a command and then detach (That is, automatically in a single script without further input beyond initially starting the script)? e.g. I run myscript.sh and it automatically starts a screen session, executes a command, then detaches.
This is an easy one:
screen -d -m yourcommand
To run a single command in screen and detach, you may try:
screen -dm sleep 10
To run multiple commands, try:
screen -dm bash -c "sleep 10; myscript.sh"
Please note that when a program terminates, screen (per default) kills the window that contained it.
If you don't want your session to get killed after script is finished, add
exec sh at the end, e.g.:
screen -dm bash -c 'sleep 5; exec sh'
To list all your sessions, try:
Related: Start Unix screen, Run command, Detach.
In order to start new session in background with name 'sleepy'
screen -S sleepy -dm sleep 60
In order to kill 'sleepy' session
screen -S sleepy -X quit
screen -dmS screen_session_name bash -c 'echo "doing stuff"; exec bash'
it happen to me when I pressed control c (sig int) to exit my program. it exits all the way from all bash. so I found this to catch SIGINT. and prevent exit from last bash. (need to type exit to exit)
screen -dmS "screenNameHere" bash -c "trap 'echo gotsigint' INT; cd /mydir ; my_command_here; bash" example: screen -dmS "status_updates" bash -c "trap 'echo gotsigint' INT; cd /opt/status_update ; forever index.js ; bash"
I find it useful to use cron to run nodejs programs on startup. and to run the screen at boot time. in cron there are special events syntax @reboot event
to edit cron, execute: crontab -e then type @reboot screen -dmS "screenNameHere" bash -c "trap 'echo gotsigint' INT; cd /mydir ; my_command_here; bash"