优化history命令输出信息

优化方法：

在/etc/profile尾部追加如下内容
HISTFILESIZE=4000  #默认保存命令是1000条，这里修改为4000条
HISTSIZE=4000
USER_IP=`who -u am i 2>/dev/null| awk '{print $NF}'|sed -e 's/[()]//g'` #取得登录客户端的IP
if [ -z $USER_IP ]
then
  USER_IP=`hostname`
fi
HISTTIMEFORMAT="%F %T $USER_IP:`whoami` "     #设置新的显示history的格式
export HISTTIMEFORMAT
 
执行source /etc/profile使其生效

效果示例：

 2553  2022-06-03 23:03:08 114.45.18.236:root vim /etc/sysctl.conf 
 2554  2022-06-03 23:03:10 114.45.18.236:root vim /etc/sysctl.conf
 2555  2022-06-03 23:03:17 114.45.18.236:root lsmod |grep bbr
 2556  2022-06-03 23:03:19 114.45.18.236:root lsmod |grep fq
 2557  2022-06-03 23:03:45 114.45.18.236:root ls
 2558  2022-06-03 23:03:46 114.45.18.236:root ll
 2559  2022-06-03 23:03:49 114.45.18.236:root cd
 2560  2022-06-03 23:03:49 114.45.18.236:root ls
 2561  2022-06-03 23:03:53 114.45.18.236:root screen -ls
 2562  2022-06-03 23:03:56 114.45.18.236:root screen -r oracle
 2563  2022-06-03 23:04:02 114.45.18.236:root screen -S oracle1
 2564  2022-06-03 23:04:39 114.45.18.236:root crontab -l