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last -t 20100101010101

#include <stdio.h>
#include <utmp.h>
#include <string.h>
#include <time.h>

int main(void) {
        struct utmp *line;
        time_t timestamp;
        utmpname("/var/log/wtmp");
        setutent();
        while( (line = getutent()) != NULL) {
                if (line->ut_type == USER_PROCESS ) {
                        timestamp = line->ut_tv.tv_sec;
                        printf("%s %s", line->ut_user, asctime(localtime(&timestamp)));
                }
        }
        endutent();
        return 0;
}

$ gcc -Wall source.c -o progname

# !/usr/bin/bash

ssh unadm@$1 ' lsuser -a time_last_login ALL | sed 's/\ time_last_login=/:/g' > /userlogins

cat userlogins | grep : > temp | awk -F":" '{print $2}' temp | xargs -I {} perl -le "print scalar localtime ({})" > temp1
awk -F":" '{print $1}' temp > temp2
paste temp2 temp1
rm temp temp1 temp2

# !/usr/bin/bash
if [ $# -eq 1 ]
then
echo "IPADDRESS : $1"
ssh unadm@$1 ' echo "HOSTNAME: $(hostname) \t  DATE: $(date)"'
ssh unadm@$1 "sudo lsuser -a time_last_login ALL | sed 's/\ time_last_login=/:/g'" > userlogins
cat userlogins | grep : > temp; awk -F":" '{print $2}' temp | xargs -I {} perl -le "print scalar localtime ({})" > temp1
awk -F":" '{print $1}' temp > temp2
paste temp2 temp1 | awk -F" " '{ printf "%-20s %s %s %-2d %s %d\n", $1, $2, $3, $4, $5, $6 }'
rm temp temp1 temp2
exit
else
echo "USAGE: $0 <IPADDRESS>"
exit 1
fi
bash-3.00$

HOSTNAME: test1     DATE: Thu Jun 17 00:11:13 CDT 2010
root                 Thu Jul 24 05:02:01 2008
testuser             Sun Jan 25 12:49:22 2009
mqm                  Tue Sep 9  04:23:46 2008
db2inst1             Sat Sep 12 00:38:38 2009
jrnj0i0              Mon Apr 13 05:51:25 2009
prp0i0               Mon Sep 7  00:24:04 2009