所有参考资料都写在文末，侵删致歉。
jq is a lightweight and flexible command-line JSON processor.
jq 是一款命令行下处理 JSON 数据的工具。
其可以接受标准输入，命令管道或者文件中的 JSON 数据，经过一系列的过滤器(filters)和表达式的转后形成我们需要的数据结构并将结果输出到标准输出中。
jq 的这种特性使我们可以很容易地在 Shell 脚本中调用它。
brew install jq
sudo apt-get install jq
yum -y install epel-release && yum -y install jq
YAML Ain't Markup Language
YAML is a human friendly data serialization standard for all programming languages.
http://www.ruanyifeng.com/blog/2016/07/yaml.html
YAML实质上是一种通用的数据串行化格式。
more...TTY is a toolbox for developing beautiful command line clients in Ruby
with a fluid interface for gathering input, querying terminal
properties and displaying information.
但此处比较的不是这个RUBY命令行工具。
What is the exact difference between a ‘terminal’, a ‘shell’, a ‘tty’ and a ‘console’?
终端，Shell，“tty”和控制台（console）有什么区别？
(以下内容皆从上述链接中复制粘贴整理所得，侵删致歉)
A terminal is at the end of an electric wire, a shell is the home of a turtle, tty is a strange abbreviation and a console is a kind of cabinet.
In unix terminology, the short answer is that
terminal = tty = text input/output environment（文本的输入输出环境）console = physical terminal（物理终端）shell = command line interpreter(命令行解释器)
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
以下全部引用自：
Redhat7中yum安装以及问题解决办法(YUM和wget都无法使用的情况下)
解决：
1 | cat /etc/redhat-release |
1 | rpm -qa |grep yum |
yum安装不上就只能手动下载传上去了
1 | rpm -qa|grep yum|xargs rpm -e --nodeps（不检查依赖，直接删除rpm包） |
https://blog.csdn.net/wangshubo1989/article/details/73784907
Go 编程语言 - Chinese Translation of tip.golang.org
more...