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半角英数 – B-LOG https://blog.bugyo.tk/b-log bugyoのlog。決してblogではない。 Wed, 24 Aug 2011 10:06:32 +0000 en-US hourly 1 https://wordpress.org/?v=5.7.2 [sed] 全角英数を半角にする https://blog.bugyo.tk/b-log/archives/744 https://blog.bugyo.tk/b-log/archives/744#respond Wed, 24 Aug 2011 10:06:32 +0000
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http://blog.bugyo.tk/b-log/?p=744 output.txt のようにすれば、全角英数を半角英数に置換できる。]]> あるテキストファイルの全角英数を半角英数に変換する必要があった。

文字ごとの置換には sed の y 関数を使う。

  sed 'y/置換する文字*/置換後の文字*/'

として、置換する文字と対応する置き換え先の文字を列挙する。

% sed 'y/ABCDEFGHIJKLMNOPQRSTUVWXYZ¥
abcdefghijklmnopqrstuvwxyz0123456789/¥
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789/'¥
input.txt > output.txt

のようにすれば、全角英数を半角英数に置換できる。

]]>
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