使用 awk 查找第一次出現

我有一個日誌文件，當我的腳本執行時會更新。該腳本將在啟動時插入“腳本開始”文本，並在完成執行時插入“腳本結束”文本。我正在嘗試擷取“腳本開始”和“腳本結束”之間的文本。最近的條目位於日誌的底部。

使用以下內容很接近，但它給了我日誌中的所有事件，如下所示。

tac /opt/novell/JDBCFanout/activemqstatus.log |awk '/End of script/,/Start of script/'|tac

2014-09-09 12:30:42 - Start of script
2014-09-09 12:30:42 - Monitoring Reset script for the ActiveMQ.
2014-09-09 12:30:42 - The ActiveMQ value is not 1, the ActiveMQ services will not be restarted. The current value is 0.
2014-09-09 12:31:35 - The Fanout driver state is:  0
2014-09-09 12:33:32 - Sleeping for 10 seconds before checking the status of the Fanout driver.
2014-09-09 12:35:05 - The Fanout driver state is:  1
2014-09-09 12:35:05 - ERROR: The Fanout driver failed to start. The Fanout driver needs to be manually restarted.
2014-09-09 12:35:05 - End of script
2014-09-09 13:17:17 - Start of script
2014-09-09 13:17:17 - Reset script for the ActiveMQ.
2014-09-09 13:17:17 - The ActiveMQ flag is 1, shutting down the ActiveMQ services and the Fanout driver.
2014-09-09 13:17:17 - The ActiveMQ flag is now set to 0.
2014-09-09 13:17:17 - Stopping the Fanout driver.
2014-09-09 13:17:27 - The script is now cleaning up the pid's.
2014-09-09 13:17:37 - The script is now archiving the ActiveMQ Logs.
2014-09-09 13:17:37 - No files older than 60 days.
2014-09-09 13:17:47 - The script is now starting the ActiveMQ services.
2014-09-09 13:19:57 - The ActiveMQ service is running,
2014-09-09 13:19:57 - The ActiveMQ Oracle service is running.
2014-09-09 13:19:57 - The ActiveMQ MSSQL service is running.
2014-09-09 13:19:57 - The ActiveMQ Queue Manager service is running.
2014-09-09 13:19:58 - Sleeping for 10 seconds before checking the status of the Fanout driver.
2014-09-09 13:20:09 - The Fanout driver successfully restarted.
2014-09-09 13:20:09 - End of script

具體來說，我希望輸出看起來像這樣，而不是如上所示的所有出現。

2014-09-09 13:17:17 - Start of script
2014-09-09 13:17:17 - Reset script for the ActiveMQ.
2014-09-09 13:17:17 - The ActiveMQ flag is 1, shutting down the ActiveMQ services and the Fanout driver.
2014-09-09 13:17:17 - The ActiveMQ flag is now set to 0.
2014-09-09 13:17:17 - Stopping the Fanout driver.
2014-09-09 13:17:27 - The script is now cleaning up the pid's.
2014-09-09 13:17:37 - The script is now archiving the ActiveMQ Logs.
2014-09-09 13:17:37 - No files older than 60 days.
2014-09-09 13:17:47 - The script is now starting the ActiveMQ services.
2014-09-09 13:19:57 - The ActiveMQ service is running,
2014-09-09 13:19:57 - The ActiveMQ Oracle service is running.
2014-09-09 13:19:57 - The ActiveMQ MSSQL service is running.
2014-09-09 13:19:57 - The ActiveMQ Queue Manager service is running.
2014-09-09 13:19:58 - Sleeping for 10 seconds before checking the status of the Fanout driver.
2014-09-09 13:20:09 - The Fanout driver successfully restarted.
2014-09-09 13:20:09 - End of script

提前感謝您可以分享的任何幫助！

也許是一個小狀態機：

tac file |
awk '/End of script/ {p=1} p {print} p && /Start of script/ {exit}' |
tac

可以說比格倫的答案更簡單（儘管它確實需要輸入兩次“腳本開始”）：

tac*日誌文件*| awk '/腳本結束/,/腳本開始/{print} /腳本開始/{exit}' | tac

或者

tac*日誌文件*| sed -n '/腳本結束/,/腳本開始/p; /腳本開始/q' | tac

引用自：https://unix.stackexchange.com/questions/154651