watchuser amit 10
which will watch if amit logs in or out every 10 seconds.
#!/bin/sh # others/watchuser case $# in 0) echo 'Usage: ' $prog '<username> <check interval(secs)>'; exit 1;; esac name=$1 if test "$2" = "" then interval=60 else interval=$2 fi who | awk '{print $1}' | grep $name >& /dev/null if test "$?" = "0" then loggedin=true echo $name is logged in else loggedin=false echo $name not logged in fi while true do who | awk '{print $1}' | grep $name >& /dev/null if test "$?" = "0" then if test "$loggedin" = "false" then loggedin=true echo $name is logged in fi else if test "$loggedin" = "true" then loggedin=false echo $name not logged in fi fi sleep $interval done