用于提取特定搜索字符串模式前后的行的Unix命令

如何在文件中搜索行并提取搜索行的行上方和行下方的行

我的意见是

Tue Jun 26 14:59:46 2012
 Warning ffffffff act_msg_ctms_remove_from_pending_queue: deleting message 44817201 from the queue.
Tue Jun 26 14:59:46 2012
 Warning ffffffff Finishing processing record number 44817201
Tue Jun 26 14:59:46 2012
 Warning  5000000 activity_queue_manager_finish_cb: unknown activity 120.
Tue Jun 26 14:59:46 2012
 Warning ffffffff Activity State Machine priority (2) finished
Tue Jun 26 14:59:46 2012
 Warning ffffffff 
====================================================
Processing database file "INCOMING_MESSAGES" record number 47810234 from user "(unknown)"
Tue Jun 26 14:59:46 2012
 Warning ffffffff ACTIVITY data: rec_num (47810234) size (116) 
Tue Jun 26 14:59:46 2012
 Warning ffffffff activity status: ACT_SENT 
Tue Jun 26 14:59:46 2012
 Warning ffffffff MESSAGE body "MVT
QFA6673/26.VHQOS.BNE
EA0541
"
Tue Jun 26 14:59:46 2012
 Warning ffffffff Finishing processing record number 47810234
Tue Jun 26 14:59:46 2012
 Warning ffffffff Activity State Machine priority (1) finished
Tue Jun 26 14:59:46 2012
 Warning ffffffff 
End processing record number 47810234

====================================================

我要求我的输出像

/

Tue Jun 26 14:59:46 2012
 Warning ffffffff MESSAGE body "MVT
QFA6673/26.VHQOS.BNE
EA0541"

/

我的搜索字符串将是MVT

---

请帮助

Grep可以选择在比赛前后立即显示行。下面命令行中的数字是匹配前后要显示的适当行数。例如

grep-A3-B5 yoursearchpattern输入文件模式

man grep对于选项的详细信息非常有用

假设您有GNU grep，要检查是否可以使用--version选项：

> grep --version
GNU grep 2.6.3

---

比赛前后三行

grep -C 3 pattern filename 

要更多地控制要为匹配显示的前后行数，请使用

grep -A (num of after) -B (num of lines before)  pattern filename

从

man grep

：

 -A NUM, --after-context=NUM
          Print NUM lines of trailing context after matching lines.  
          Places a line containing -- between contiguous groups of matches.

   -a, --text
          Process a binary file as if it were text; 
          this is equivalent to the --binary-files=text option.

   -B NUM, --before-context=NUM
          Print NUM lines of leading context before matching lines.  
          Places a line containing -- between contiguous groups of matches.

   -C NUM, --context=NUM
          Print NUM lines of output context.  
          Places a line containing -- between contiguous groups of matches.

---

谢谢，+1为-C选项，一直在使用A和B，今天学习了一个新字母@jpe：但使用A和B是对问题的正确回答，因为他在“之后”和“之前”的上下文行不同。：）在这两种情况下，它都会抛出一个称为非法的错误option@wanted：这是给gnu grep的。你在用哪个grep？