bash 在一个 while 循环中从两个文件中读取行
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Reading lines from two files in one while loop
提问by Village
I have a file, file1.csvcontaining:
我有一个文件，file1.csv其中包含：
This
is
some
text.
I am using while read lineto cycle through each line, e.g.:
我正在使用while read line循环遍历每一行，例如：
while read line; do
echo $line
done < file1.csv
I have another file, with an identical number of lines, called file2.csv:
我有另一个文件，行数相同，称为file2.csv：
A
B
C
D
The data each line corresponds to data in the first file of the same line number.
每行的数据对应第一个文件中相同行号的数据。
- How can I modify the while loop, such so that it can print the corresponding line from
file2.csv?
- 如何修改 while 循环，以便它可以从 打印相应的行
file2.csv？
回答by Ignacio Vazquez-Abrams
Use another FD.
使用另一个FD。
while read line; do
if ! read -u 3 line2
then
break
fi
echo "$line***$line2"
done < file1.csv 3< file2.csv
回答by Mat
You could try with the pasteutility:
您可以尝试使用该paste实用程序：
$ cat one
this
is
some
text
$ cat two
1
2
3
4
$ while read a b ; do echo $a -- $b ; done < <(paste one two)
this -- 1
is -- 2
some -- 3
text -- 4
回答by kev
You can use the pastecommand:
您可以使用以下paste命令：
$ paste -d, file{1,2}.csv | while IFS=, read x y; do echo "$x:$y"; done
This:A
is:B
some:C
text.:D
