How to delete a list of line numbers 1

[latebeat]

Hello to everyone,
I'm pleased to say this is my first post on this forum

Guys, I'm trying to find a quick way to delete certain lines numbers from a text file. This text file is generated daily, has about 5000 lines every time and is then processed by another application.
However some lines are malformed and I get an error message from the aforementioned application telling me the line numbers that are erroneous.
So far I have been searching/deleting these lines manually but it's a pain in the butt to do this for 40-80 every time plus I have to do this at 5am in the morning so I really want to do it as fast as possible so I can get back to sleep!
So my question is how can I delete these particular line numbers with awk?

My idea is to create a new text file with the problematic line numbers like:

7
450
560
1002
3004
4000

and then pass this new file to awk to remove them from the other text file.

So far I've found this post here:

http://www.tek-tips.com/viewthread.cfm?qid=1143016&page=1

but it only works for 2 numbers. Any ideas how I can modify it to work with a random number of lines every time?

thanks,
Anestis

 

[PHV]

awk 'NR==FNR{n[$1];next}!(FNR in n)' linenumbers input > output

Hope This Helps, PH.
FAQ219-2884
FAQ181-2886

 

[latebeat]

It worked great! Thanks a lot PHV!

 

[latebeat]

this is really weird... I tried it again today and it's not working? How's that possible? Does it have any limitations like a fixed number of input line-numbers?

I've uploaded here the two text files
hxxp://

http://www.megaupload.com/?d=HJ9ZPMJ3

One is the lines.txt and the other is the input text file (~4000lines). When I pass the exact same argument as above the output is giving me the original file! No lines are removed whatsoever!

Any help is *greatly* appreciated

 

[Annihilannic]

Worked fine for me using those input files.

What OS are you doing this under? Those input files are in DOS format with CR/LF line terminators, which may be confusing your implementation of awk if it's on Unix. Try using dos2unix on the files first... or tr -d '\r'.

Annihilannic.

 

[latebeat]

That was it! I created the linenumbers file under windows and then tried to use it under linux. It never crossed my mind to change the line ending

thanks again,

you are a life saver!