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screen -ls
screen -XS [screen sessionid] quit
#eg: screen -XS 20411 quit
Terminate all Detached Screen sessions
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screen -ls | grep Detached | cut -d. -f1 | awk '{print $1}' | xargs -r kill
Or to kill all Screens:
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screen -ls | grep pts | cut -d. -f1 | awk '{print $1}' | xargs -r kill
https://stackoverflow.com/questions/14447131/kill-all-detached-screen-sessions