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help
===
显示帮助信息
## 补充说明
**help命令** 用于显示shell内部命令的帮助信息。help命令只能显示shell内部的命令帮助信息。而对于外部命令的帮助信息只能使用man或者info命令查看。
### 语法
```
```
### 选项
```
：
```
### 参数
内部命令：
### 实例
使用help命令显示shell内部shopt命令的帮助信息， ：
```
shopt: shopt [-pqsu] [-o long-option] optname [optname...]
Toggle the values of variables controlling optional behavior.
The -s flag means to enable (set) each OPTNAME; the -u flag
unsets each OPTNAME. The -q flag suppresses output; the exit
status indicates whether each OPTNAME is set or unset. The -o
option restricts the OPTNAMEs to those defined for use with
`set -o'. With no options, or with the -p option, a list of all
settable options is displayed, with an indication of whether or
not each is set.
```
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