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
---------------------------------------------if条件判断
[root@Top ~]# cat creatuser.sh
#!/bin/bash
read -p "Please enter a username:" USER_NAME
if `getent passwd $USER_NAME > /dev/null`;then
echo "This user already exists!"
else useradd $USER_NAME
echo `getent passwd $USER_NAME`
fi
[root@Top ~]# bash creatuser.sh
Please enter a username:user5
user5:x:2007:2007::/home/user5:/bin/bash
[root@Top ~]# bash creatuser.sh
Please enter a username:user1
This user already exists!
----------------------------------------------短路与短路或条件判断
#!/bin/bash
getent passwd $1 > /dev/null && echo "This user already exists!" || (useradd $1; getent passwd $1)
[root@Top ~]# bash creatuser1.sh user1
This user already exists!
[root@Top ~]# bash creatuser1.sh user7
user7:x:2009:2009::/home/user7:/bin/bash
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
set ignorecase
set cursorline
set autoindent
set nu
set paste
set et
set tabstop=4
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: LinXiaoLong")
call setline(5,"#Phone: 18509163451")
call setline(6,"#Mail: 18509163451@163.com")
call setline(7,"#Date: ".strftime("%Y-%m-%d"))
call setline(8,"#FileName: ".expand("%"))
call setline(9,"#******************************************************************************")
call setline(10,"set -ue")
call setline(11,"")
endif
endfunc
autocmd BufNewFile * normal G
3、查找/etc目录下大于1M且类型为普通文件的所有文件
⏱ 20:25:17-root:~# find /etc -size +1M -a -type f -exec ls -lh {} \;
-rw-r--r-- 1 root root 8.2M Sep 22 06:56 /etc/selinux/targeted/policy/policy.31
-r--r--r-- 1 root root 8.8M Dec 13 02:08 /etc/udev/hwdb.bin
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。
find /etc/ -name "*.conf" | xargs tar czvf `date +%F`.tar.gz && cp -a `date +%F`.tar.gz /usr/local/src
find /etc/ -name "*.conf" | xargs tar czvf `date +%F`.tar.gz;cp -a `date +%F`.tar.gz /usr/local/src
#两种方式均可，第一种方法似乎更好
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
⏱ 22:36:13-root:/date# find / \( -nouser -o -nogroup \) -atime -7 -exec stat {} \;
find: ‘/proc/3712/task/3712/fd/9’: No such file or directory
find: ‘/proc/3712/task/3712/fdinfo/9’: No such file or directory
find: ‘/proc/3712/fd/8’: No such file or directory
find: ‘/proc/3712/fdinfo/8’: No such file or directory
File: /opt/home/mage
Size: 62 Blocks: 0 IO Block: 4096 directory
Device: fd00h/64768d Inode: 134859146 Links: 2
Access: (0700/drwx------) Uid: ( 1007/ UNKNOWN) Gid: ( 1007/ UNKNOWN)
Access: 2020-12-29 22:08:36.192285090 +0800 #访问时间
Modify: 2020-11-15 18:21:00.000000000 +0800
Change: 2020-12-06 15:03:05.263408864 +0800
Birth: -
File: /opt/home/wang
Size: 62 Blocks: 0 IO Block: 4096 directory
Device: fd00h/64768d Inode: 201330291 Links: 2
Access: (0700/drwx------) Uid: ( 1008/ UNKNOWN) Gid: ( 1008/ UNKNOWN)
Access: 2020-12-29 22:08:36.192285090 +0800 #访问时间
Modify: 2020-11-15 18:21:05.000000000 +0800
Change: 2020-12-06 15:03:05.263408864 +0800
Birth: -
File: /opt/home/hc
Size: 62 Blocks: 0 IO Block: 4096 directory
Device: fd00h/64768d Inode: 827204 Links: 2
Access: (0700/drwx------) Uid: ( 1011/ UNKNOWN) Gid: ( 1011/ UNKNOWN)
Access: 2020-12-29 22:25:21.882249589 +0800 #访问时间
Modify: 2020-12-29 22:25:09.742310375 +0800
Change: 2020-12-29 22:25:09.742310375 +0800
Birth: -
File: /opt/home/hc/.bash_logout
Size: 18 Blocks: 8 IO Block: 4096 regular file
Device: fd00h/64768d Inode: 827205 Links: 1
Access: (0644/-rw-r--r--) Uid: ( 1011/ UNKNOWN) Gid: ( 1011/ UNKNOWN)
Access: 2020-12-29 22:25:07.040323903 +0800 #访问时间
Modify: 2019-11-09 00:21:40.000000000 +0800
Change: 2020-12-06 15:03:05.263408864 +0800
Birth: -
6、查找/etc目录下至少有一类用户没有执行权限的文件
⏱ 23:54:06-root:/date# find /etc ! -perm /111 -exec ls -l {} \;|more （说实话，题干还是似懂非懂）
-rw-r--r--. 1 root root 655 Nov 8 13:09 /etc/fstab
-rw-------. 1 root root 0 Nov 8 13:09 /etc/crypttab
-rw-r--r-- 1 root root 266 Dec 29 19:46 /etc/resolv.conf
-rw-r--r--. 1 root root 80 Nov 8 13:10 /etc/dnf/modules.d/satellite-5-client.module
......
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