1、统计出/etc/passwd文件中其默认shell为非/sbin/nologin的用户个数,并将用户都显示出来
[root@client ~]#{ grep -v "/sbin/nologin" /etc/passwd |cut -d: -f1;grep -v "/sbin/nologin" /etc/passwd|wc -l;}
2、查出用户UID最大值的用户名、UID及shell类型
[root@client ~]#cut -d: -f1,3,7 /etc/passwd|sort -t: -k2 -nr|head -n1
3、统计当前连接本机的每个远程主机IP的连接数,并按从大到小排序
#方法一
[root@client ~]#ss -ant|grep "ESTAB"|tr -s ' '|cut -d ' ' -f5|cut -d: -f1|uniq -c|sort -nr
2 10.0.0.1
#方法二
[root@client ~]#ss -ant|grep "ESTAB"|awk '{print $5}'|awk -F: '{print $1}'|sort |uniq -c|sort -nr
2 10.0.0.1
4、编写脚本disk.sh,显示当前硬盘分区中空间利用率最大的值
[root@client ~]#cat disk.sh
#!/bin/bash
#
#********************************************************************
#Author: jiangfeng
#QQ: 1461918614
#Date: 2021-07-21
#FileName: disk.sh
#Description: The test script
#Copyright (C): 2021 All rights reserved
#********************************************************************
DISK=$(df|grep "^/dev/sd*"|tr -s " " "%" |cut -d% -f5|sort -nr|head -n1)
echo "$DISK"
[root@client ~]#bash disk.sh
15
5、编写脚本 systeminfo.sh,显示当前主机系统信息,包括:主机名,IPv4地址,操作系统版本,内核版本,CPU型号,内存大小,硬盘大小
[root@client ~]#cat systeminfo.sh
#!/bin/bash
#
#********************************************************************
#Author: jiangfeng
#QQ: 1461918614
#Date: 2021-07-21
#FileName: systeminfo.sh
#Description: The test script
#Copyright (C): 2021 All rights reserved
#********************************************************************
RED="\E[1;31m"
GREEN="\E[1;32m"
END="\E[0m"
echo -e "$GREEN----------------Host systeminfo---------------------$END"
echo -e "HOSTNAME: $RED`hostname`$END"
echo -e "IPADDR: $RED`ifconfig eth0|grep -Eo '([0-9]{1,3}\.){3}[0-9]{1,3}' |head -n1`$END"
echo -e "OSVERSION: $RED`cat /etc/redhat-release`$END"
echo -e "KERNEL: $RED`uname -r`$END"
echo -e "CPU: $RED`lscpu|grep 'Model name'|tr -s ' '|cut -d: -f2`$END"
echo -e "MEMORY: $RED`free -h|grep Mem|tr -s ' ' :|cut -d: -f2`$END"
echo -e "DISK: $RED`lsblk |grep '^sd' |tr -s ' '|cut -d " " -f4`$END"
echo -e "$GREEN----------------------------------------------------$END"
[root@client ~]#bash systeminfo.sh
----------------Host systeminfo---------------------
HOSTNAME: client
IPADDR: 10.0.0.133
OSVERSION: CentOS Linux release 8.3.2011
KERNEL: 4.18.0-240.el8.x86_64
CPU: Intel(R) Core(TM) i5-8300H CPU @ 2.30GHz
MEMORY: 1.9Gi
DISK: 200G
----------------------------------------------------
6、通关vimtutor(可参考https://yyqing.me/post/2017/2017-02-22-vimtutor-chinese-summary)