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Kill -9 -1 combination

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# 1  
Old 11-10-2019
Kill -9 -1 combination

Good morning, In a Production environment ive seen this command that kills processes
kill -9 -1

Because i am in a production environmet i can not execute this comamnd, so i would like to know what is the difference for the conventional kill -9 PID ?
Thanks a lot
# 2  
Old 11-10-2019
man kill:

kill -9 -1 Kill all processes you can kill.

Your shell may have its own version of kill which may behave slightly different; pls. verify upfront.

Last edited by RudiC; 11-10-2019 at 10:55 AM..
# 3  
Old 11-10-2019
I think knowing a bit more about your production environment could help us guess the purpose:
- what is the architecture and OS?
- What kind of production are we talking about?

As for the rest RudiC has made it clear what is normally expected... so replying to RudiC's request would be cool too and will provide us better understanding
# 4  
Old 11-10-2019
never EVER run this command as root - as it will inevitably cause your system to restart.
If run as normal user, it will in all likelyhood kill all processes running as this user at once - including the user shell the user is in (so you will be kicked out)
This User Gave Thanks to zxmaus For This Post:
# 5  
Old 11-11-2019
Good afternnon:

Thank you very much all of you for your help

This is 1 of 4th web application node using apache as a webserver, and as a Production env it receives all the htpp traffic from internet throuh a load balancer called (F5 -A10) and by a java process called germ.jar open sockets to port 89xx (load balancer), so below is the information:

$ /bin/bash --version
GNU bash, version 4.2.46(2)-release (x86_64-redhat-linux-gnu)
Copyright (C) 2011 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later

$ uname -a
Linux serverbam04.nh 4.1.12-124.15.2.el7uek.x86_64 #2 SMP Tue May 22 11:52:31 PDT 2018 x86_64 x86_64 x86_64 GNU/Linux

openjdk version "1.8.0_171"
OpenJDK Runtime Environment (build 1.8.0_171-b10)
OpenJDK 64-Bit Server VM (build 25.171-b10, mixed mode)

webserver apache

EE-plus-7.0.2/lib/openejb-javaagent.jar -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -classpath /usr/share/tomEE-plus-7.0.2/bin/bootstrap.jar:/usr/share/tomEE-plus-7.0.2/bin/tomcat-juli.jar -Dcatalina.base=/usr/share/tomEE-plus-7.0.2 -Dcatalina.home=/usr/share/tomEE-plus-7.0.2 -Djava.io.tmpdir=/usr/share/tomEE-plus-7.0.2/temp org.apache.catalina.startup.Bootstrap start

The reason why i asked whad does kill -9 -1 does is because our web application provider suggested every time we shut down the app, i will have to run this command to make sure all session are cleaned, but i didnt know how powerful or dangerous this command will be

some time ago the user med has 1615 processes because a shell that runs every 5 minutes got stuck and blocked the node, and we contact aour System Administrator but these processes could never get killed and this node had to be started

med+ 32737     1  0 14:49 ?        00:00:00 /bin/bash /app/perm/backend/check_port_process/CHECK_PORT_PROCESS_MAIN.sh
 32742     1  0 13:15 ?        00:00:00 /bin/bash /app/perm/backend/check_port_process/CHECK_PORT_PROCESS_MAIN.sh
$ ps -fu med|wc -l

kill command
ps -fu med | grep -v grep | awk '{print $2}' | xargs kill -9

Thanks again for your help
# 6  
Old 11-11-2019
Might be a candidate for the pkill command?
# 7  
Old 11-11-2019
Yes pkill -u med && sleep 5 && pkill -9 -u med would be a smart command (the "friendly" kill first).
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