[root@centos7 ~]# 
[root@centos7 ~]# cd /data/script/
[root@centos7 script]# ls
createuser.sh
[root@centos7 script]# cat createuser.sh 
#!/bin/bash
#使用一個用戶名做為參數，如果指定參數的用戶存在，就顯示其存在，否則添加之;顯示添加的用戶的id號等信息
#日期2020-12-22
#/data/scipts/createuser.sh
read -p "請輸入一個用戶名：" USERNAME
if `id $USERNAME &> /dev/null`;then
echo "用戶存在，用戶的ID信息為：`id $USERNAME`"
else
PASSWORD=`cat /dev/urandom | tr -cd A-Za-z0-9| head -c6`
`useradd $USERNAME &> /dev/null`
`echo "$PASSWORD" | passwd --stdin $USERNAME &> /dev/null`
echo "用戶名:$USERNAME 密碼：$PASSWORD" >> /data/user.txt
`chage -d 0 $USERNAME`
echo "用戶已添加，用戶的ID信息為：`id $USERNAME` 密碼為：$PASSWORD"
fi
[root@centos7 script]# ll /home
total 0
drwx------  2 mageia    mageia 62 Dec 10 19:08 linux
drwx------  2      1005 distro 62 Dec 10 19:07 mandriva
drwx------  2 slackware distro 62 Dec 10 19:14 slackware
drwx------  2 user1     user1  83 Dec 10 19:51 user1
drwx------  2 user2     user2  62 Dec 10 19:35 user2
drwx------  2 user3     user3  62 Dec 10 19:35 user3
drwx------  2 wang      wang   62 Dec 22 16:23 wang
drwx------. 2 wukui     wukui  83 Nov 25 10:16 wukui
[root@centos7 script]# bash createuser.sh 
請輸入一個用戶名：wang
用戶存在，用戶的ID信息為：uid=2007(wang) gid=2007(wang) groups=2007(wang)
[root@centos7 script]# bash createuser.sh 
請輸入一個用戶名：zhang
用戶已添加，用戶的ID信息為：uid=2008(zhang) gid=2008(zhang) groups=2008(zhang) 密碼為：6VZxTs
[root@centos7 script]# bash createuser.sh 
請輸入一個用戶名：li
用戶已添加，用戶的ID信息為：uid=2009(li) gid=2009(li) groups=2009(li) 密碼為：lmdgH0
[root@centos7 script]# 

# 編輯~/.vimrc配置文件
[root@centos7 ~]# cat ~/.vimrc
set tabstop=4
[root@centos7 ~]# vim ~/.vimrc
[root@centos7 ~]# vim ~/.vimrc
[root@centos7 ~]# vim
[root@centos7 ~]# cat ~/.vimrc
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:                          N51045")
         call setline(5,"#QQ:                              1467551834")
         call setline(6,"#version:                         1.0")
         call setline(7,"#Date   :                         ".strftime("%Y-%m-%d"))
         call setline(8,"#FileName:                        ".expand("%"))
         call setline(9,"#URL:                             http://www.magedu.com")
         call setline(10,"#Description:                     The test script")
         call setline(11,"#Copyright (C):                  ".strftime("%Y")." All rights reserved")
         call setline(12,"#************************************************************************************")
         call setline(13,"")
      endif
 endfunc
 autocmd  BufNewFile  * normal G

[root@centos7 ~]# 
# 新建測試腳本文件test.sh
[root@centos7 ~]# ls
anaconda-ks.cfg  f1.txt
[root@centos7 ~]# vim test.sh
[root@centos7 ~]# ls
anaconda-ks.cfg  f1.txt  test.sh
[root@centos7 ~]# cat test.sh 
#!/bin/bash
#
#*************************************************************************************
#Author:                          N51045
#QQ:                              1467551834
#version:                         1.0
#Date   :                         2020-12-22
#FileName:                        test.sh
#URL:                             http://www.magedu.com
#Description:                     The test script
#Copyright (C):                  2020 All rights reserved
#************************************************************************************

[root@centos7 ~]#

# 方法一
[root@centos7 ~]# find /etc/ -size +1M -a -type f -exec ls -lhS {}   \+;
-r--r--r--. 1 root root 8.0M Nov 25 06:40 /etc/udev/hwdb.bin
-rw-------. 1 root root 3.8M Apr  1  2020 /etc/selinux/targeted/active/policy.kern
-rw-r--r--. 1 root root 3.8M Apr  1  2020 /etc/selinux/targeted/policy/policy.31
-rw-r--r--. 1 root root 1.4M Apr  1  2020 /etc/selinux/targeted/contexts/files/file_contexts.bin
[root@centos7 ~]#
# 方法二
[root@centos7 ~]# find /etc/ -size +1M -a -type f | xargs ls -lhS
-r--r--r--. 1 root root 8.0M Nov 25 06:40 /etc/udev/hwdb.bin
-rw-------. 1 root root 3.8M Apr  1  2020 /etc/selinux/targeted/active/policy.kern
-rw-r--r--. 1 root root 3.8M Apr  1  2020 /etc/selinux/targeted/policy/policy.31
-rw-r--r--. 1 root root 1.4M Apr  1  2020 /etc/selinux/targeted/contexts/files/file_contexts.bin
[root@centos7 ~]#

[root@centos7 ~]# 
[root@centos7 ~]# ll /usr/local/src/
total 0
[root@centos7 ~]# find /etc/ -name "*.conf" | xargs tar -cpf `date +%F`.tar && cp -a `date +%F`.tar /usr/local/src/
tar: Removing leading `/' from member names
[root@centos7 ~]# date
Tue Dec 22 20:17:28 CST 2020
[root@centos7 ~]# ll -h 2020-12-22.tar  /usr/local/src/2020-12-22.tar
-rw-r--r-- 1 root root 190K Dec 22 20:16 2020-12-22.tar
-rw-r--r-- 1 root root 190K Dec 22 20:16 /usr/local/src/2020-12-22.tar
[root@centos7 ~]#

[root@centos7 ~]# find / \( -nouser -o -nogroup \) -atime +7 \( -type f -o -type d \) | xargs ls -lh
find: ‘/proc/2113/task/2113/fdinfo/6’: No such file or directory
find: ‘/proc/2113/fdinfo/5’: No such file or directory
-rw-r--r-- 1 1005 distro  18 Apr  1  2020 /home/mandriva/.bash_logout
-rw-r--r-- 1 1005 distro 193 Apr  1  2020 /home/mandriva/.bash_profile
-rw-r--r-- 1 1005 distro 231 Apr  1  2020 /home/mandriva/.bashrc
-rw-rw---- 1 1005 mail     0 Dec 10 19:07 /var/spool/mail/mandriva
[root@centos7 ~]#

[root@centos7 ~]# find /etc -not -perm -111 | wc -l
2040
[root@centos7 ~]# find /etc ! -perm -111 | wc -l
2040
[root@centos7 ~]#