質問編集履歴
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回答を元に書き直しました
test
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File without changes
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test
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@@ -42,6 +42,46 @@
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###追記
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46
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```Ruby
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50
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51
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def tail(lines, filename)
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File.open(filename) do |io|
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chars_array = []
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io.seek(0, IO::SEEK_END)
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while chars_array.count("\n") != lines
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chars_array << io.read(1)
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io.seek(-2, IO::SEEK_CUR)
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end
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p chars_array.reverse.join
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end
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end
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tail(5, __FILE__)
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```
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### 補足情報
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46
86
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47
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ruby 2.7.2p137です。
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