logcheck.sh

#script to check the time taken to login the user.
echo "Enter the username: \c"
read logname

#checking by if block username is exist.
grep "$logname" /etc/passwd > /dev/null
if [ $? -eq 0 ]
then
    echo "Wait..."
else
    echo "User not found."
    exit
fi

time=0

while true
do
    who | grep "$logname" > /dev/null
    if [ $? -eq 0 ]
    then
        echo "$logname has logged in."
        if [ $time -ne 0 ]
        then
            if [ $time -gt 60 ]
            then
                min=`expr $time / 60`
                sec=`expr $time % 60`
                echo "$logname was $min minutes and $sec second late in logging in."
            else
                sec=$time
                echo "$logname was $sec second late in logging in."
            fi
        fi
        exit
    else
        time=`expr $time + 1`
        sleep 1
    fi
done