How to calculate time

[kaspareov]

Hello Guys,

I am trying to calculate total hours and minutes a given user has used the system since the beginning of the current month.

#!/usr/bin/sh

hr=0
min=0

last $1 | grep -w `date "+%b"` | grep -v '\(0[2-9]:.*\)' | grep -vw sshd | cut -c 66-
| tr -d "[ ]\(\)" | cut -f1 -d ":" | grep -v '[a-z].*' | while read line

do
        hr=`expr "$hr" + "$line"`
        echo User $1 spent total $hr
done

last $1 | grep -w `date "+%b"` | grep -v '\(0[2-9]:.*\)' | grep -vw sshd | cut -c 66-
| tr -d "[ ]\(\)" | cut -f2 -d ":" | grep -v '[a-z].*' | while read line
do
        min=`expr "$min" + "$line"`
         if [ $min -ge 60 ]
        then
                min=`expr "$min" - 60`
                hr=`expr "$hr" + 1`
         echo User $1 spent $hr hours and $min minutes the current month.
        continue
        fi
done

echo "User $1 spent $hr hours and $min minutes the current month."

My code is working fine. I have problem with variable. I can't use variable outside loop. It showing 0 hours and 0 minutes.


Thanking You,