record command of every user

userlog.sh

#!/bin/bash

PS1="`whoami`@`hostname`:"'[$PWD]'
history
USER_IP=`who -u am i 2>/dev/null| awk '{print $NF}'|sed -e 's/[()]//g'`
if [ "$USER_IP" = "" ]
then
  USER_IP=`hostname`
fi
if [ ! -d /tmp/history ]
then
  mkdir /tmp/history
  chmod 777 /tmp/history
fi
if [ ! -d /tmp/history/${LOGNAME} ]
then
  mkdir /tmp/history/${LOGNAME}
  chmod 300 /tmp/history/${LOGNAME}
fi
export HISTSIZE=4096
DT=`date +"%Y%m%d_%H%M%S"`
export HISTFILE="/tmp/history/${LOGNAME}/${USER_IP}.history.$DT"
chmod 600 /tmp/history/${LOGNAME}/*history* 2>/dev/null