1、编写脚本 createuser.sh，实现如下功能:使用一个用户名做为参数，如果 指定参数的用户存在，就显示其存在，否则添加之;显示添加的用户的id号等信息
[root@localhost ~]# vim createuser.sh
#!/bin/bash
#
#********************************************************************
#Author: ye
#QQ: 1787183478
#Date: 2020-12-26
#FileName： createuser.sh
#URL: https://www.jianshu.com/u/8d17cce24779
#Description： The test script
#Copyright (C): 2020 All rights reserved
#********************************************************************
read -p "input the user who you want:" user
if id $user &>/dev/null;
then
echo "$user is existed"
else
useradd $user &>/dev/null && echo "$user is created!"
echo "$user userinfo: `grep $user /etc/passwd |cut -d: -f1,3,7`"
fi
[root@localhost ~]# chmod +x createuser.sh
[root@localhost ~]# ./createuser.sh
input the user who you want:ye
ye is created!
ye userinfo: ye:1000:/bin/bash
[root@localhost ~]# ./createuser.sh
input the user who you want:ye
ye is existed
2、编写生成脚本基本格式的脚本，包括作者，联系方式，版本，时间，描述等
[root@localhost ~]# vim .vimrc
set ignorecase
set cursorline
set autoindent
autocmd BufNewFile *.sh exec ":call SetTitle()"
func SetTitle()
if expand("%:e") == 'sh'
call setline(1,"#!/bin/bash")
call setline(2,"#")
call setline(3,"#********************************************************************")
call setline(4,"#Author: ye")
call setline(5,"#QQ: 1787183478")
call setline(6,"#Date: ".strftime("%Y-%m-%d"))
call setline(7,"#FileName： ".expand("%"))
call setline(8,"#URL: https://www.jianshu.com/u/8d17cce24779")
call setline(9,"#Description： The test script")
call setline(10,"#Copyright (C): ".strftime("%Y")." All rights reserved")
call setline(11,"#********************************************************************")
call setline(12,"")
endif
endfunc
autocmd BufNewFile * normal G
[root@localhost ~]# source .vimrc
3、查找/etc目录下大于1M且类型为普通文件的所有文件
[root@localhost ~]# find /etc/ -size +1M -a -type f -exec ls -lhS {} +
-r--r--r--. 1 root root 8.8M Dec 9 04:41 /etc/udev/hwdb.bin
-rw-r--r--. 1 root root 8.4M Dec 9 04:36 /etc/selinux/targeted/policy/policy.31
4、打包/etc/目录下面所有conf结尾的文件，压缩包名称为当天的时间，并拷贝到/usr/local/src目录备份。
[root@localhost ~]# find /etc/ -name "*.conf" |xargs tar zcvf /usr/local/src/`date +%F`.tar.gz
[root@localhost ~]# ls /usr/local/src/
2020-12-26.tar.gz
5、查找当前系统上没有属主或属组，且最近一个周内曾被访问过的文件或目录
[root@localhost ~]# find / -nouser -o -nogroup -a -atime -7|xargs ls -l
find: ‘/proc/1999/task/1999/fd/9’: No such file or directory
find: ‘/proc/1999/task/1999/fdinfo/9’: No such file or directory
find: ‘/proc/1999/fd/8’: No such file or directory
find: ‘/proc/1999/fdinfo/8’: No such file or directory
-rw-r--r--. 1 1002 1002 18 Nov 9 2019 /home/test1/.bash_logout
-rw-r--r--. 1 1002 1002 141 Nov 9 2019 /home/test1/.bash_profile
-rw-r--r--. 1 1002 1002 312 Nov 9 2019 /home/test1/.bashrc
-rw-r--r--. 1 1001 1001 18 Nov 9 2019 /home/test/.bash_logout
-rw-r--r--. 1 1001 1001 141 Nov 9 2019 /home/test/.bash_profile
-rw-r--r--. 1 1001 1001 312 Nov 9 2019 /home/test/.bashrc
-rw-rw----. 1 1001 mail 0 Dec 26 04:16 /var/spool/mail/test
-rw-rw----. 1 1002 mail 0 Dec 26 04:18 /var/spool/mail/test1
/home/test:
total 0
/home/test1:
total 0
6、查找/etc目录下至少有一类用户没有执行权限的文件
[root@localhost ~]# find /etc/ -not -perm /111|xargs ls -l
-rw-r--r--. 1 root root 16 Dec 9 04:40 /etc/adjtime
-rw-r--r--. 1 root root 1529 Apr 7 2020 /etc/aliases
-rw-r--r--. 1 root root 541 Nov 9 2019 /etc/anacrontab
-rw-r--r--. 1 root root 1 May 11 2019 /etc/at.deny
......
