Searching a log for a specific pattern & exporting it-can it be done? 2

[bazil2]

(Elementary user)

I have a very large log file that contains thousand of lines and I would like to search for a specific pattern in this log and output this to another file.

I would like to search for this pattern: */@*

A line entry in the log would look like this:

May 4 11:10:46.17 recv [19380] 4BB4CBA84 < 6>: 'A04BB4CBA84' message From:'<user@somedomain.com>' To:'<jon.doe/@anotherdomain.com>' Size: 14072

Is there a way of:
1) searching the log file,
2) looking for matches
3) putting those lines containing my match in another file

Best regards

 

[Noway2]

Yes, you can use a pattern matching language called regular expressions. As far as matching the patterns and exporting them to a file, the tool SED will do just this.

I apologize for the terseness of the reply. I don't have much time at the moment otherwise I would try to give you some examples. Looking for the above two items should get you started in the right direction, though.

 

[feherke]

Hi

Sounds like [tt]grep[/tt] would be enough. And [tt]grep[/tt] ( especially the GNU implementation ) is usually much faster than [tt]sed[/tt] or other complex tools.

grep '/@' log.file > match.file

And given that actually you are looking for a fixed string anywhere in the line, you can speed it up by turning off regular expression matching :

grep -F '/@' log.file > match.file

Feherke.

http://free.rootshell.be/~feherke/

 

[bazil2]

Thank you so much, this worked beautifully and was very fast!

Best regards