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It's only to logout all other user's except "root"
There are 2 alternatives - vote for the best!
Logs all users out except root.
I changed the grep to use a regexp in case a user's username contained the word root.
This command logs out all users - which is way more secure to use ps -ef and "grep" to kill processes.
Never ever use ps -ef piped to grep to kill something. If you ever need to ps-something use the UNIX95-directive, which makes sure you will never need "grep" together with "ps".
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Add a `sort -u` so things will be killed only once:
who -u|grep -v root|awk {'print $6'}|sort -u|kill `awk {'print $0'}`Or uniq
who -u|grep -v root|awk {'print $6'}|uniq|kill `awk {'print $0'}`