如何用另一个文件的头替换一个文件的头

Question

我想用标题中file1.csv的标题替换标题file2.csv

file1.csv
"a","b","c"

file2.csv
"x","y","z"

我想要file1.csv的标题为

"x","y","z"

请告诉我怎么做？我试过

sed -i "1 s/^.*$/$file2.csv/" file1.csv

但它不需要""（引号）。我想要带引号的标题。

Answer 1

如果你坚持这样做sed：

( sed 1q file2.csv; sed 1d file1.csv ) >file3.csv && mv file3.csv file1.csv

没有sed：

( head -1 file2.csv; tail -n +2 file1.csv ) >file3.csv && mv file3.csv file1.csv