$ /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

# install
$ xcode-select --install

# delete
$ sudo rm -rf `xcode-select -p` # 一般会在文件夹 /Library/Developer/CommandLineTools 内

# Problems
## Can’t install the software because it is not currently available from the Software Update server.
# 手动下载
https://developer.apple.com/download/more/?=command%20line%20tools

# 仅适用文件夹
# 命令行输入如下内容
exitFun() {
  echo "ERROR: failed, due to $1"
  exit 1
}

fix() {
    [ ! -d "${1}" ] && exitFun "target is not folder"
    mv "${1}" "${1}_back"
    mkdir "${1}"
    mv "${1}_back"/* "${1}/"
    mv "${1}_back"/.[^.]* "${1}/"
    rmdir "${1}_back"
}

# 修复，输入 fix <文件夹目录> OR 输入 fix [拖拽文件夹至终端]
$ fix <path>	

mysql -h localhost --port 3306 -u root -p --socket=/var/lib/mysql/mysql.sock  

#### 示例
bovenson@MBP:~/Git/notes/MySQL$ mysql -h localhost -u root -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 14
Server version: 5.7.20 MySQL Community Server (GPL)

Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> 

### Mac
sudo /usr/local/mysql/support-files/mysql.server start	# 启动
sudo /usr/local/mysql/support-files/mysql.server stop	# 停止
sudo /usr/local/mysql/support-files/mysql.server restart	# 重启

# set password for 用户名@localhost = password('新密码'); 
set password for root@localhost = password('123'); 

# 修改
ALTER USER 'user'@'localhost' IDENTIFIED BY 'pass';

CREATE USER 'myuser'@'localhost' IDENTIFIED BY 'mypass';
CREATE USER 'myuser'@'%' IDENTIFIED BY 'mypass';

GRANT ALL ON *.* TO 'myuser'@'localhost';
GRANT ALL ON *.* TO 'myuser'@'%';
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' WITH GRANT OPTION;

> FLUSH PRIVILEGES;

# mysql
sudo vim /etc/mysql/mysql.conf.d/mysqld.cnf
# mariadb
/etc/mysql/mariadb.conf.d/50-server.cnf

# 修改bind-address
bind-address = 0.0.0.0

mysql -u root -p -h 10.154.0.43 -P 3306

> USE mysql;
> UPDATE user SET Host='%' WHERE User='root' AND Host='localhost';

> SOURCE /path/to/file.sql;

> CREATE DATABASE 'database-name';

> select * from <table> \G

# 下载 rpm 源
$ wget https://repo.mysql.com//mysql57-community-release-el7-11.noarch.rpm

# 安装 rpm 源
$ yum localinstall mysql57-community-release-el7-11.noarch.rpm

# 安装 MySQL
$ yum install mysql-community-server

# 启动 MySQL
$ systemctl start mysqld

# 开机启动
$ systemctl enable mysqld
$ systemctl daemon-reload

# 获取root密码
$ cat /var/log/mysqld.log | grep password
... [Note] A temporary password is generated for root@localhost:  ...

# 登录mysql
$ mysql -u root -p	
# 输入获取到的临时密码

# 重置root密码
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY '{password}'; 

# 更新密码
mysql > UPDATE mysql.user SET Password=PASSWORD('root') WHERE User='root' AND Host='%';

# 新建远程登录用户
mysql> CREATE USER 'root'@'%' IDENTIFIED BY '{password}';

# 授权
mysql> GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' WITH GRANT OPTION;

# 刷新权限
mysql> FLUSH PRIVILEGES;

# 防火墙放行3306端口
$ firewall-cmd --zone=public --add-port=3306/tcp --permanent
$ firewall-cmd --reload

$ mysqldump -uroot -p<password> -h 'host' -P port <database>  # 导出数据库
$ mysqldump -uroot -p<password> -h 'host' -P port <database> <table>  # 导出表
$ mysqldump -uroot -p<password> d <database>

$ npm install hexo-cli -g

$ hexo init <folder>
$ cd <folder>
$ npm install

.
├── _config.yml     # 配置
├── package.json    # 依赖描述
├── scaffolds       # 模板文件夹
├── source          # 资源文件夹，除_posts外，_开头文件夹会被忽略
|   ├── _drafts
|   └── _posts
└── themes          # 主题

$ hexo generate

# ubuntu
$ sudo apt install vsftpd

# ubuntu
/etc/vsftpd.conf

listen=YES    # 是否监听网络端口, 默认NO

local_enable=YES    # 允许使用本地用户账号密码登录

# [required] 安装 pam & htpasswd
$ sudo apt install libpam-pwdfile apache2-utils

# [required] 创建目录
$ sudo mkdir /home/ftp
$ sudo mkdir /etc/vsftpd

# [required] /etc/vsftpd.conf 修改为如下配置
listen=YES
anonymous_enable=NO
local_enable=YES
write_enable=YES
local_umask=022
nopriv_user=vsftpd
virtual_use_local_privs=YES
guest_enable=YES
user_sub_token=$USER
local_root=/var/www/$USER        # root, 登录前确保用户目录已存在
chroot_local_user=YES
hide_ids=YES
guest_username=vsftpd
user_config_dir=/etc/vsftpd_user_conf
allow_writeable_chroo=YES

# [required] 创建ftp用户
$ sudo htpasswd -cd /etc/vsftpd/ftpd.passwd user-name    # then enter password
# -c: create, 如需额外添加，去除该参数

# [required] /etc/pam.d/vsftpd 替换为如下内容
auth required pam_pwdfile.so pwdfile /etc/vsftpd/ftpd.passwd
account required pam_permit.so

# [required] 创建没有shell登录权限的本地用户 vsftpd，用于虚拟用户登录
$ sudo useradd --home /home/vsftpd --gid nogroup -m --shell /bin/false vsftpd
# [optional] 验证
$ id vsftpd

# [optional untested] 用户独立配置，配置文件路径为 ${user_config_dir}/${user}，以 wii 为例
$ sudo vim /etc/vsftpd_user_conf

# [required] 重启vsftpd
$ sudo service vsftpd restart