54 lines
2 KiB
Text
54 lines
2 KiB
Text
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#!/usr/bin/bash
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# Grab a point in time snapshot of the output from the last command
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last > /tmp/last_output
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# Alternatively because there are output variances to deal with,
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last | grep '+' > /tmp/day_more && last | grep -v '+' > /tmp/day_less
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# Now we have complete output of last, and split versions of sessions
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# that are shorter or longer than one day. We should convert days in
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# the day_more file to hours and append to day_less for consistency.
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# placeholder to code this thought process...
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# we are not interested in 00 minute entries (unless we also decide to count logins)
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# We are not interested in any users that are currently logged in or the wtmp footer
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# We are not interested in system entries either. Let's hope no users match our egrep
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egrep -v '(00:00|logged|^$|wtmp|system)' /tmp/last_output | sed 's/[()]//g' > /tmp/last_clean
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cut -d' ' -f1 /tmp/last_clean | sort -u > /tmp/unique_users
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# We can crunch data (output) in several ways; Read a line, test each field, process...
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# Or we can break our data into separate outputs (by user) before crunching the data.
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for user in $(cat /tmp/unique_users)
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do
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# Guarantee we are starting each loop with clean variables
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minute=0
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tm=0
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hour=0
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th=0
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day=0
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td=0
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for time in $(awk /^${user}/'{print $NF}' /tmp/last_clean)
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do
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temp=$(echo ${time} | cut -d+ -f1)
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if [ ${time} = ${temp} ]; then # The day indicator (+) does not exist
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day=0
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hour=$(echo ${time} | cut -d: -f1 | sed 's/^0//')
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else
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day=$(echo ${time} | cut -d+ -f1)
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hour=$(echo ${time} | cut -d+ -f2 | cut -d: -f1 | sed 's/^0//')
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fi
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# We use sed to strip padded 0's in single digit values for math (07 becomes just 7)
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minute=$(echo ${time} | cut -d: -f2 | sed 's/^0//')
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((td = td + day))
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((th = th + hour))
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((tm = tm + minute))
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done
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# We have our column totals, but now we need to normalize the output again
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minute=$(expr $tm % 60)
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hour=$(expr `echo "$tm / 60 + $th" | bc` % 24)
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day=$(expr `echo "$tm / 60 + $th" | bc` / 24 + $td)
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printf "%8s %4d + %02d : %02d \n" $user $day $hour $minute
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done
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