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help
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===
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显示帮助信息
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## 说明
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**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。
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### 语法
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```
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help(选项)(参数)
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```
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```
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-s：输出短格式的帮助信息。仅包括命令格式。
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```
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### 参数
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内部命令：指定需要显示帮助信息的shell内部命令。
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### 实例
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使用help命令显示shell内部shopt命令的帮助信息，输入如下命令：
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```
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help shopt #获取shopt命令的帮助信息
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shopt: shopt [-pqsu] [-o long-option] optname [optname...]
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Toggle the values of variables controlling optional behavior.
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The -s flag means to enable (set) each OPTNAME; the -u flag
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unsets each OPTNAME. The -q flag suppresses output; the exit
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status indicates whether each OPTNAME is set or unset. The -o
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option restricts the OPTNAMEs to those defined for use with
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`set -o'. With no options, or with the -p option, a list of all
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settable options is displayed, with an indication of whether or
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not each is set.
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```
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