search - grep一个文件，但显示几个周围的行？(grep a file, but show several surrounding lines?)

Question

I would like to grep for a string, but also show the preceding five lines and the following five lines as well as the matched line.

(我想grep一个字符串，但也显示前五行和以下五行以及匹配的行。)

How would I be able to do this?

(我怎么能这样做？)

  ask by Mark Harrison translate from so

Answer 1

For BSD or GNU grep you can use -B num to set how many lines before the match and -A num for the number of lines after the match.

(对于BSD或GNU grep您可以使用-B num来设置匹配前的行数和匹配后的行数的-A num 。)

grep -B 3 -A 2 foo README.txt

If you want the same number of lines before and after you can use -C num .

(如果你想要使用-C num之前和之后的相同行数。)

grep -C 3 foo README.txt

This will show 3 lines before and 3 lines after.

(这将显示之前的3行和之后的3行。)