Use the date and who commands to write a program called conntime that prints the number of hours and minutes that a user has been logged on to the system (assume that this is less than 24 hours).

Question

What will be an ideal response?

Answer 1

login=$(who | grep "^$1 " | head -1)

lhour=$(echo $login | cut -d\ -f5 | cut -d: -f1)
lmin=$(echo $login | cut -d\ -f5 | cut -d: -f2)

hour=$(date +%H)
min=$(date +%m)

elapsed_hours=$(( $hour - $lhour ))
elapsed_mins=$(( $min - $lmin ))

if [ $elapsed_mins -lt 0 ] ; then
elapsed_mins=$(( $elapsed_mins + 60 ))
elapsed_hours=$(( $elapsed_hours - 1 ))
fi

echo "User $1 logged in at ${lhour}:$lmin, and it's currently ${hour}:$min"
echo "Elapsed login time is $elapsed_hours hours and $elapsed_mins minutes"