| Author |
Remove unwanted text from a big text file
|
Sam Saha
Ranch Hand
Joined: Jan 23, 2010
Posts: 76
|
|
I have a log file which contains a big text lines. I wanted to keep the important lines and remove the unwanted lines from the big text file. I am new in UNIX. I would appreciate if someone can help me write UNIX script to remove the unwanted line from the text file.
Actual Text is like this in the log file:
I wanted the output to be like this:
|
 |
Andrew Monkhouse
author and jackaroo
Marshal Commander
Joined: Mar 28, 2003
Posts: 9982
|
|
How did you go with Peter's starting suggestions? No point in us rehashing old ground.
Personally, I think that this is a job that calls for Global Regular Expression Print(ing) - grep. Peter's suggestion is closer to what you originally requested, insofar as you would end up with a program that is relatively easy to read and maintain, even by people who don't do much shell scripting. Whereas using grep will result in a more concise script. If you are interested in going the grep route, you may want to look at the Wikipedia article on grep, especially the examples.
|
The Sun Certified Java Developer Exam with J2SE 5: paper version from Amazon, PDF from Apress, Online reference: Books 24x7 Personal blog
|
|
Tim Holloway
Saloon Keeper
Joined: Jun 25, 2001
Posts: 12513
|
|
|
It's worth noting, however, that for the sample message, that the app has had a simple data validation error. For a production app, that should have been intercepted and logged more concisely, since there's no need for a stack trace and there is conversely the possibility that a sufficiently-aware "catch" clause in a Struts action processor might be able to provide more useful context to the message that actually got logged. Assuming that invalid data even needs logging in the first place.
|
One of the most odious afflictions that Business has inflicted on the modern English language is "pro-active". Most of the time it's simply redundantly used in place of the simple old word "active". And a good deal of the rest of the time it means "You're not overworked enough yet, so go out and find more!"
|
|
Duc Quoc
Greenhorn
Joined: Dec 15, 2011
Posts: 2
|
|
Sam Saha wrote:I have a log file which contains a big text lines. I wanted to keep the important lines and remove the unwanted lines from the big text file.
... ... ...
I wanted the output to be like this:
From the shell prompt (console), you can use simple grep command like this: (assumed the log file is "server.log" )
It will filter out all the lines with "at " strings, hence results to your expected text.
To write the output text to a new logfile (says, it's "newfile.log"), simply add like following:
We can also achieve the expected result with sed, awk, perl, vim, ... but I think grep is simple enough :-)
|
|
 |
|
|
subject: Remove unwanted text from a big text file
|
|
|
0
