在Linux中将包含单词的行从一个文件复制到另一个文件 [英] copy lines containing word from one file to another file in linux

问题描述

我想将包含某些单词的行从file1复制到file2.

I want to copy lines containing certain words from file1 to file2.

假设file1:

ram 100 ct 50
gopal 200 bc 40
ravi 50 ct 40
krishna 200 ct 100

file2应该仅包含包含"ct"的行，如下所示:

file2 should have only the lines containing "ct", which would look like this:

ram 100 ct 50
ravi 50 ct 40
krishna 200 ct 100

哪个是实现此目标的最佳方法?我有一个200mb的文件. 我使用了grep，但是运行grep -n ct file1却没有任何结果.

Which is the best way to achieve this? I had a file of 200mb. I used grep but I didn't get any result running grep -n ct file1.

推荐答案

此awk应该做的

awk '/ct/' file1 > file2

如果位置很重要

awk '$3=="ct"' file1 > file2
awk '$3~/ct/' file1 > file2

如果ct是字段#3中的某些内容的一部分，则

最新版本没问题

last version is ok if ct is part of some in field #3

与grep

grep ct file1 > file2

不需要

-n，因为它会打印行号

-n is not needed, since it prints line number

与sed

sed -n '/ct/p' file1 > file2

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