howmuchtime

CURR_TIME=`date +%s`
TIME_CURRENT=0
TIME_PAST=0

PrintTime()
{
    printf '%dh %dm %ds\n' $(($1/3600)) $(($1%3600/60)) $(($1%60))
}


LINES=$(
for x in /var/log/wtmp*
do
    last -T -s -f "$x" | grep "^$1\ " | grep in$ | tr -s ' ' | cut -d ' ' -f 4
done
)

echo
echo ========== current sessions ==========

for line in $LINES
do
    DIFF=$((CURR_TIME-line))
    PrintTime $DIFF
    TIME_CURRENT=$((TIME_CURRENT+DIFF))
done

echo ========== total ==========
PrintTime $TIME_CURRENT


LINES2=$(
for x in /var/log/wtmp*
do
    last -s -f "$x" | grep "^$1\ " | grep -v still | cut -d '(' -f 2 | cut -d ')' -f 1
done
)

echo
echo ========== past sessions ==========

for line in $LINES2
do
    PrintTime $line
    TIME_PAST=$((TIME_PAST+line))
done

echo ========== total ==========
PrintTime $TIME_PAST

echo
echo ========== total time ==========
TOTAL_TIME=$((TIME_CURRENT+TIME_PAST))
PrintTime $TOTAL_TIME