The following will grab you an integer of the number of hours an active user has logged into a computer:
user=$( ls -l /dev/console | awk '{ print $3 }' ) ; ac users $user | awk '{ print $2 }'
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The following will grab you an integer of the number of hours an active user has logged into a computer:
user=$( ls -l /dev/console | awk '{ print $3 }' ) ; ac users $user | awk '{ print $2 }'