add getlogins

bin/getlogins

@@ -0,0 +1,53 @@
+#!/usr/bin/bash
+
+# Grab a point in time snapshot of the output from the last command
+last > /tmp/last_output
+
+# Alternatively because there are output variances to deal with,
+last | grep '+' > /tmp/day_more && last | grep -v '+' > /tmp/day_less
+
+# Now we have complete output of last, and split versions of sessions
+# that are shorter or longer than one day. We should convert days in
+# the day_more file to hours and append to day_less for consistency.
+# placeholder to code this thought process...
+
+# we are not interested in 00 minute entries (unless we also decide to count logins)
+# We are not interested in any users that are currently logged in or the wtmp footer
+# We are not interested in system entries either. Let's hope no users match our egrep
+egrep -v '(00:00|logged|^$|wtmp|system)' /tmp/last_output | sed 's/[()]//g' > /tmp/last_clean
+cut -d' ' -f1 /tmp/last_clean | sort -u > /tmp/unique_users
+
+# We can crunch data (output) in several ways; Read a line, test each field, process...
+# Or we can break our data into separate outputs (by user) before crunching the data.
+for user in $(cat /tmp/unique_users)
+do
+# Guarantee we are starting each loop with clean variables
+minute=0
+tm=0
+hour=0
+th=0
+day=0
+td=0
+
+for time in $(awk /^${user}/'{print $NF}' /tmp/last_clean)
+do
+temp=$(echo ${time} | cut -d+ -f1)
+if [ ${time} = ${temp} ]; then # The day indicator (+) does not exist
+day=0
+hour=$(echo ${time} | cut -d: -f1 | sed 's/^0//')
+else
+day=$(echo ${time} | cut -d+ -f1)
+hour=$(echo ${time} | cut -d+ -f2 | cut -d: -f1 | sed 's/^0//')
+fi
+# We use sed to strip padded 0's in single digit values for math (07 becomes just 7)
+minute=$(echo ${time} | cut -d: -f2 | sed 's/^0//')
+((td = td + day))
+((th = th + hour))
+((tm = tm + minute))
+done
+# We have our column totals, but now we need to normalize the output again
+minute=$(expr $tm % 60)
+hour=$(expr `echo "$tm / 60 + $th" | bc` % 24)
+day=$(expr `echo "$tm / 60 + $th" | bc` / 24 + $td)
+printf "%8s %4d + %02d : %02d \n" $user $day $hour $minute
+done