how to find how many users have logged in and logged out in last five minutes using shell scripts?

Track and filter the output of the last command

By Typing Who command

By writing "who -Hu" you get following details o/p

Name        Line           Time     Activity       PID Hostname

Use w command give time from when the user is logged in.
w is extended who command.

Using SIGALRM

who -u|sort -rk4

Current_time=date +%H:%M
who -u | awk ' $4 - $Current_time == 5 {print } '

last -5|grep -i "logged in"|wc -l
last -5|grep -v "logged out"|wc -l

Current_time=`date +%H%M`
who -u | awk $Current_time - $4 <= 5 { print }