Shell Programming and Scripting

Can someone help me with a script to capture the list of users logged on at a point of time, and if a particular user id say xyz exists, kill that process Id.

You need use below commands to get your result.

Code:

who
ps -ef  |grep xyz

If you ask how, please do some research first.

this is something that came into my mind before but i didnt seriously think about it.
"who -u" gives the users who logged into a system anytime. I tried to write one script now and then tested it, but as im only user logged in test server i couldnt kill my login pid, should try later

try this:

Code:

#!/bin/bash
who -u | /usr/xpg4/bin/awk '/SPECIFIC_USER_IP/ {gsub("^\(|\)$","",$8);print($0)}' OFS="\t" > users.txt
user_ip=`/usr/xpg4/bin/awk '{print($8)}' users.txt`
pid=`/usr/xpg4/bin/awk' {print($7)}' users.txt`
if [ -e "$user_ip" ]; then
kill -9 $pid
fi

Note: you can use the user name in 2nd column instead of ip address in 8th column of "who -u" output

Code:

shell>who -u
root       pts/1        Jan  6 23:55   .     9492       (192.168.1.24)

Regards