打印匹配行，以及显示匹配行下面的的几行（转）

grep -A 5 pattern yourfile   显示匹配pattern的行以及后面五行。


-A 后面跟着你想要显示几行，

grep手册中的解释：
Context Line Control
-A NUM, --after-context=NUM
Print NUM lines of trailing context after matching lines.
Places a line containing a group separator (--) between
contiguous groups of matches. With the -o or --only-matching
option, this has no effect and a warning is given.

-B NUM, --before-context=NUM
Print NUM lines of leading context before matching lines.
Places a line containing a group separator (--) between
contiguous groups of matches. With the -o or --only-matching
option, this has no effect and a warning is given.

-C NUM, -NUM, --context=NUM
Print NUM lines of output context. Places a line containing a
group separator (--) between contiguous groups of matches. With
the -o or --only-matching option, this has no effect and a
warning is given.

 
简单翻译就是，-A -B -C 后面都跟阿拉伯数字，-A是显示匹配后和它后面的n行。-B是显示匹配行和它前面的n行。-C是匹配行和它前后各n行。总体来说，-C覆盖面最大。用它保险些。