Merge pull request #10 from colorbook/master

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Having written the script, you can invoke it by sh scriptname, [1] or alternatively bash scriptname. (Not recommended is using sh <scriptname, since this effectively disables reading from stdin within the script.) Much more convenient is to make the script itself directly executable with a chmod.
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Having written the script, you can invoke it by sh scriptname, [1] or alternatively bash scriptname. 
>`要執行腳本，我們可以使用 「sh 腳本檔名」 或「bash 腳本檔名」來執行。`
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