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不正なマルチバイト文字ですと表示された時の対処法

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不正なマルチバイト文字ですと出た時は、文字化けしてしまい読み込めていない可能性が高いです。

文字コードを調べる

まずはfileコマンドを用いて文字コードを調べる。

qiita.rb
file sample.csv

sample.csv: Non-ISO extended-ASCII text, with very long lines, with CRLF line terminators

Non-ISO extended-ASCII textは文字コードがShift-JISであることを示しています。

icovコマンドで文字コードを変換する

qiita.rb
iconv -f sjis -t utf8 sample.csv > utf8sample.csv

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