bash grep like 命令来查找匹配的线和邻域线
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grep like command to find matching lines plus neighbourhood lines
提问by ztank1013
grepcommand is really powerful and I use it a lot.
grep命令非常强大，我经常使用它。
Sometime I have the necessity to find something with grep looking inside many many files to find the string I barely remember helping myself with -i(ignore case) option, -r(recursive) and also -v(exclude).
有时我需要用 grep 在许多文件中查找一些东西来找到我几乎不记得使用-i（忽略大小写）选项、-r（递归）和-v（排除）帮助自己的字符串。
But what I really need is to have a special output from grep which highlight the matching line(s) plus the neighbourhood lines(given the matching line I'd like to see, let's say, the 2 preceding and the 2 subsequent lines).
但我真正需要的是 grep 的特殊输出，它突出显示匹配线和邻域线（给定我想看到的匹配线，假设是前 2 行和后 2 行）。
Is there a way to get this result using bash?
有没有办法使用 bash 获得这个结果？
采纳答案by ennuikiller
most greps allow the "context" flag making it a bit more readable:
大多数 grep 允许“上下文”标志，使其更具可读性：
grep --context=3 foo myfile.txt
回答by Kristjan Adojaan
You can omit -C
你可以省略 -C
grep -2 foo myfile.txt
is equal to
等于
grep -C 2 foo myfile.txt
