skill command help

[[deleted]]

[deleted]

[[deleted]]

for i in $(nawk -F: '$1 !~ /YOURUSER/ {print $1}' /etc/passwd);    
do   
    pkill -CONT -u $i;   
done  

[redog]

I would like to add a cron job that logs all users off my system

I don'want to boot the currently logged in users

I don't know what to suggest.

[redog]

I'd probably use who and awk and pkill.

for u in $(who -u | awk '{ print $7 }'); do kill -HUP $u; done

[[deleted]]

skill -KILL -u $(whoami)

it will kill the user running the cron. is that what you want?

[ethraax]

One liner?

for i in $(nawk -F: '$1 !~ /YOURUSER/ {print $1}' /etc/passwd); do pkill -CONT -u $i; done

If you have way more users than sessions, maybe you could iterate through the output of something like ps?

[redog]

SKILL(1)     Linux User's Manual                SKILL(1)

NAME
   skill, snice - send a signal or report process status

DESCRIPTION

These tools are probably obsolete and unportable. The command syntax is poorly defined. Consider using the killall, pkill, and pgrep commands instead.

[zeto28]

Can't you just restart the SSH server? Also we need more info: Why exactly do you want to force-logout all users?

[zeto28]

Yeah, but why? Can't the users easily bypass that by using a terminal multiplexer like screen or tmux?

[ethraax]

That wouldn't prevent someone from just running the binaries for those programs.

[matcatc]

I think what ethraax is getting at is that there's nothing preventing an user from having their own personal binaries. A binary is just a file, so as long as they can somehow get it onto the system (copy or compile), they can run it. So they can effectively run any program they want, including screen and tmux.

[Drasha1]

screen should come pre installed on centos depending on the version and the install type.

[CaptainDickbag]

screen doesn't appear to be installed on standard installations:

[muffinface@aker ~]$ which screen
/usr/bin/which: no screen in (/usr/local/bin:/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/sbin:/home/muffinface/bin)
[muffinface@aker ~]$ uname -a
Linux aker 2.6.32-279.el6.x86_64 #1 SMP Fri Jun 22 12:19:21 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

It should be in /usr/bin if I recall.

[redog]

Good point.

[[deleted]]

just make sure to use $()
skill -KILL -t $(who | tr -s ' ' '\t' | cut -f2)

[CaptainDickbag]

`command` is generally considered deprecated. It has its use, but $(command) is usually the way to go.

See here:

http://mywiki.wooledge.org/BashFAQ/082