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実行例追記
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`idea.`は行末には無いですね。`idea.\`が行末です。
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よって`grep 'idea.\$' zen.txt` でコマンド実行してください。
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```text
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$ cat zen.txt
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The Zen of Python, by Tim Peters
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Beautiful is better than ugly.
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Explicit is better than implicit.
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Simple is better than complex.
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Complex is better than complicated.
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Flat is better than nested.
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Sparse is better than dense.
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Readability counts.
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Special cases aren't special enough to break the rules.
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Although practicality beats purity.
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Errors should never pass silently.
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Unless explicitly silenced.
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In the face of ambiguity, refuse the temptation to guess.
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There should be one-- and preferably only one --obvious way to do it.
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Although that way may not be obvious at first unless you're Dutch.
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Now is better than never.
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Although never is often better than *right* now.
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If the implementation is hard to explain, it's a bad idea.\
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If the implementation is easy to explain, it may be a good idea.\
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Namespaces are one honking great idea -- let's do more of those!
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$ grep 'idea.\$' zen.txt
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If the implementation is hard to explain, it's a bad idea.\
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If the implementation is easy to explain, it may be a good idea.\
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```
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