From man kill:kill -9 -1      Kill all processes you can kill.But when I do sudo /bin/kill -9 -1 nothing happens.My uname -a for info: Linux michal-Q530 3.16.0-45-generic #60~14.04.1-Ubuntu SMP Fri Jul 24 21:16:23 UTC 2015 x86_64 x86_64 x86_64 GNU/LinuxAnd I'm on Lubuntu.UPDATE:$ ps -e | wc -l169$ sudo /bin/kill -9 -1$ ps -e | wc -l169
Why kill -9 -1 doesn't work?
kill
Finally solved by using this:sudo /bin/kill -9 -- -1If the first PID is negative, it has to be preceded by -- so it's not interpreted as an option.So the real behavior of /bin/kill is distinct from the behavior described in the man page.