asked on

shell program

write a shell program(boune shell) on the following topic.

watching all people logging in and out and report as people come and go- a sort of incremental who. also display statistics of people logged in and logged out every 2 minutes.

jonke

Is this the sort of thing you are after?

#!/bin/ksh
#
#Lets see who is on the system at the moment
#
clear
echo "USERS WHO ARE CURRENTLY ON THE SYSTEM"
echo ""
who
who > /tmp/who1
#
#Create an eternal loop
#
LOOP=1
while (( $LOOP == 1 ))
do
sleep 20
#
#Make it all nice and neat
#
clear
echo "USERS WHO ARE CURRENTLY ON THE SYSTEM"
echo ""
who
who > /tmp/who2
#
#Compare who output, with the one from 2 mins ago
#
diff /tmp/who1 /tmp/who2 > /tmp/who_diff
grep ">" /tmp/who_diff > /tmp/who_joined
grep "<" /tmp/who_diff > /tmp/who_left
#
#Then output who is currently on the system, who has left and who has joined
#in a presentable format
#
echo ""
echo "USERS THAT HAVE LOGGED ONTO THE SYSTEM"
echo ""
if [[ -s /tmp/who_joined ]]
then
cat /tmp/who_joined
else
echo "No users have logged onto the system in the last 2 mins"
fi

jonke

Sorry- you wanted bourne shell didn't you?

Here is the revised version:

#!/bin/sh
#
#Lets see who is on the system st the moment
#
clear
echo "USERS WHO ARE CURRENTLY ON THE SYSTEM"
echo ""
who
who > /tmp/who1
#
#Create an eternal loop
#
while [ 1 ]
do
sleep 120
#
#Make it all nice and neat
#
clear
echo "USERS WHO ARE CURRENTLY ON THE SYSTEM"
echo ""
who
who > /tmp/who2
#
#Compare who output, with the one from 2 mins ago
#
diff /tmp/who1 /tmp/who2 > /tmp/who_diff
grep ">" /tmp/who_diff > /tmp/who_joined
grep "<" /tmp/who_diff > /tmp/who_left
#
#Then output who is currently on the system, who has left and who has joined
#in a presentable format
#
echo ""
echo "USERS THAT HAVE LOGGED ONTO THE SYSTEM"
echo ""
if [ -s /tmp/who_joined ]
then
cat /tmp/who_joined
else
echo "No users have logged onto the system in the last 2 mins"
fi
echo ""
echo "USERS THAT HAVE LEFT THE SYSTEM"
echo ""
if [ -s /tmp/who_left ]

then
cat /tmp/who_left
else
echo "No users have logged off the system in the last 2 mins"
fi
echo ""
cp /tmp/who2 /tmp/who1
rm /tmp/who_joined /tmp/who_left
done

ASKER CERTIFIED SOLUTION

jonke

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial

sriram_bandi

ASKER

Thanks a lot jonke... I executed the program it is working good.