Linux 搜索结果显示为尾操作的数据?
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search with in Data displayed as a result of tail Operation?
提问by user1253847
I am working on a Java EE application where its logs will be generated inside a Linux server .
我正在开发一个 Java EE 应用程序,它的日志将在 Linux 服务器内生成。
I have used the command tail -f -n -10000 MyLog
It displayed last 1000 lines from that log file .
我使用了命令tail -f -n -10000 MyLog
它显示了该日志文件的最后 1000 行。
Now I pressed Ctrl + c in Putty to disconnect the logs updation ( as i am feared it may be updated with new requests and I will loose my data )
现在我在 Putty 中按 Ctrl + c 断开日志更新(因为我担心它可能会随着新请求更新,我会丢失我的数据)
In the displayed result, how can I search for a particular keyword ?? (Used / String name to search but it's not working)
在显示的结果中,我如何搜索特定的关键字??(使用/字符串名称进行搜索但它不起作用)
回答by tuxuday
Pipe your output to PAGER.
将您的输出通过管道传送到 PAGER。
tail -f -n LINE_CNT LOG_FILE | less
then you can use
然后你可以使用
/SEARCH_STRING
回答by Attila
You need to redirect the output from tail
into a search utility (e.g. grep
). You could do this in two steps: save the output to a file, then search in the file; or in one go: pipe the ouput to the search utility
您需要将输出重定向tail
到搜索实用程序(例如grep
)。您可以分两步执行此操作:将输出保存到文件,然后在文件中搜索;或者一次性:将输出通过管道传输到搜索实用程序
To see what goes into the file (so you can hit Ctlr+c) you can use the tee
command, which duplicates the output to the screen and to a file:
要查看文件中的内容(以便您可以按 Ctlr+c),您可以使用该tee
命令,它将输出复制到屏幕和文件中:
tail -f -n -10000 MyLog | tee <filename>
Then search within the file.
然后在文件中搜索。
If you want to pipe the result into the search utility, you can use the same trick as above, but use your search program instead of tee
如果要将结果通过管道传送到搜索实用程序,可以使用与上述相同的技巧,但使用搜索程序而不是 tee
回答by dwurf
Two ways:
两种方式:
tail -n 10000 MyLog| grep -i "search phrase"
tail -f -n 10000 MyLog | less
The 2nd method will allow you to search with /. It will only search down but you can press g to go back to the top.
第二种方法将允许您使用 / 进行搜索。它只会向下搜索,但您可以按 g 返回顶部。
Edit:On testing it seems method 2 doesn't work all that well... if you hit the end of the file it will freeze till you ctrl+c the tail command.
编辑:在测试中,似乎方法 2 不能很好地工作......如果你点击文件的末尾,它会冻结,直到你 ctrl+c 尾命令。
回答by Rob Kielty
Controlling terminal output on the fly
即时控制终端输出
While running any command in a terminal such as Putty you can use CTRL-S
and CTRL-Q
to stop and start output to the Putty terminal.
在终端(例如 Putty)中运行任何命令时,您可以使用CTRL-S
和CTRL-Q
来停止和启动到 Putty 终端的输出。
Excluding lines using grep
使用 grep 排除行
If you want to exclude lines that contain a specific pattern use grep -v
the following would remove all line that contain the string INFO
如果要排除包含特定模式的行,请使用grep -v
以下将删除所有包含字符串 INFO 的行
tail -f logfile | grep -v INFO
Show lines that do not contain the words INFO or DEBUG
显示不包含 INFO 或 DEBUG 字样的行
tail -f logfile | grep -v -E 'INFO|DEBUG'
Finally, the MOTHER AND FATHER of all tailing tools is xtail.pl
最后,所有尾随工具的母亲和父亲是xtail.pl
If you have perl on your host xtail.pl is a very nice tool to learn and in a nutshell you can use it to tail multiplefiles. Very handy.
如果您的主机上有 perl,那么 xtail.pl 是一个非常好的学习工具,简而言之,您可以使用它来跟踪多个文件。非常便利。