Create ch3.md
Merge pull request #21 from Rslw/patch-9

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Merge pull request #20 from colorbook/master

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What makes a character special? If it has a meaning beyond its literal meaning, a meta-meaning, then we refer to it as a special character. Along with commands and keywords, special characters are building blocks of Bash scripts.

Special Characters Found In Scripts and Elsewhere
Merge pull request #22 from Rslw/patch-10

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If the directory you are in ($PWD) is where scriptname is located, why doesn't this work? 

>`假如現在所在的位置跟腳本同一目錄下，為何腳本無法成功執行？`
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What makes a character special? If it has a meaning beyond its literal meaning, a meta-meaning, then we refer to it as a special character. Along with commands and keywords, special characters are building blocks of Bash scripts.

是什麼讓字元特殊呢？假設他擁有超出其字面意義的意思，一個精粹的意思，那麼我們將它作為一個特殊字元。與其他命令與關鍵字詞被建築在Bash腳本之中。
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This fails because, for security reasons, the current directory (./) is not by default included in a user's $PATH. 

>`原因是考量到安全的因素，當前所在目錄(./)並不包含使用者的$PATH`
Merge pull request #23 from Rslw/patch-11

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