Merge pull request #28 from colorbook/master

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Delete .gitsubmodule
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Table of Contents
4.1. Variable Substitution
4.2. Variable Assignment
4.3. Bash Variables Are Untyped
4.4. Special Variable Types
Variables are how programming and scripting languages represent data. A variable is nothing more than a label, a name assigned to a location or set of locations in computer memory holding an item of data.

Variables appear in arithmetic operations and manipulation of quantities, and in string parsing.
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4.1. Variable Substitution

>`變數替換`

4.2. Variable Assignment

>`變數指派`
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4.3. Bash Variables Are Untyped

>`Bash 變數是沒有特定類型的`
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4.4. Special Variable Types

>`特殊變數類型`
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Comments. Lines beginning with a (with the exception of ) are comments and will not be executed.

>`註解。句子開頭加上符號（如例子所示的『#』），代表這句子是註解並不會被執行。`
Merge pull request #29 from Rslw/patch-14

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Variables are how programming and scripting languages represent data. 

>`變數就是程式與腳本語言的「資料」。`
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Comments may also occur following the end of a command.

>`註解也會出現在命令句的後方。`
Merge pull request #30 from Rslw/patch-15

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中文翻譯新增