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csvファイルの列を連結して1列にする

Last updated at Posted at 2020-09-05

↓こんなcsvがあった時、

a,1,あ
b,2,い
c,3,う

↓こんな感じで列単位で垂直に連結したい時があった。

a
b
c
1
2
3
あ
い
う

その方法を調べても出てこなかったので、下記のように実現した。

# 使い方は $ concat_csv_columns_vertically /path/to/your/csvfile

concat_csv_columns_vertically () {
    for i in `seq 1 $(awk -F, '{ print NF; exit }' $1)`; 
        do cut -d, -f$i $1; 
    done
}

処理の内容としては、csvの列数を取得した上でcutコマンドで列を左から順に抽出しているだけ。

これの1行版は↓

$ csvfile=/path/to/your/csvfile &&  for i in `seq 1 $(awk -F, '{ print NF; exit }' ${csvfile})`; do cut -d, -f$i $csvfile; done
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