history记录重定向到隐藏文件

 抓住做怀事的家伙
           vim /etc/profile
                     #history
                      export HISTTIMEFORMAT="[%Y.%m.%d %H:%M:%S]"
                      USER_IP=`who -u am i 2>/dev/null|awk '{print $NF}'|sed -e 's/[()]//g'`
                      HISTDIR=/var/log/.hist
                      if [ -z $USER_IP  ]
                         then
                                USER_IP=`hostname`
                      fi
                      if [ ! -d $HISTDIR ]
                         then
                               mkdir -p $HISTDIR
                               chmod 777 $HISTDIR
                       fi
                       export HISTSIZE=4096
                       DT=`date +%Y%m%d_%H:%M:%S`
                       export HISTFILE="$HISTDIR/$DT.${LOGNAME}.${USER_IP}"
                       chmod 600 $HISTDIR/$DT.* 2>/dev/null