CODEWITHSUNDEEP
awksed
ToKeLu
ToKeLu

Reputation: 15

Use Output from one file to delete or outcomment lines in another file using sed / awk

So i have a gigantic file (file1) where i need to delete or outcomment specific lines, this file could look something like this: 

Lorem ipsum **abc** dolor sit amet, 
consectetur adipiscing elit. 
Cras finibus **123** laoreet dignissim. 
Curabitur dignissim auctor tortor a cursus. 
Nullam sapien ante, tempor eu rutrum
...

for this i have file2 which contains strings which i need to locate lines in file1

file2 could look like this: 

abc
123
xyz
098
...

Now, when a string from file2 is found, the line, in file1, where it is found + the line directly beneath it, should be outcommented or deleted. so that if 123 is found in the above example, it should delete these two lines (marked with --> ):

Lorem ipsum abc dolor sit amet,
consectetur adipiscing elit.
--> Cras finibus 123 laoreet dignissim.
--> Curabitur dignissim auctor tortor a cursus.
Nullam sapien ante, tempor eu rutrum
...

I hope this makes sense

I was fiddeling around with sed and awk, but never got it to work

Upvotes: 0

Views: 62

Answers (2)

Tom Fenech
Tom Fenech

Reputation: 74645

Something like this would work:

awk 'NR==FNR{a[$0]; next}p{p=0;next}{for(i in a)if(p = $0 ~ i)next}1' file2 file1

Populate the array a with the lines in file2. The first block only applies to file2 because the total record number NR is equal to the record number of the current file FNR. next skips the rest of the blocks.

For each line of file1, loop through the keys in array a. If the current line matches the key, skip the line in the output. Also assign p the true value. For lines where p is true, set it back to false but skip the line in the output. The 1 at the end is always true, so any line that has made it this far is printed, as the default action is to print the line.

Upvotes: 1

potong
potong

Reputation: 58430

This might work for you (GNU sed):

sed 's|.*|/&/{N;d}|' file2 | sed -f - file1 >file3

Create a sed script from file2 and run it against file1 saving the results in file3.

Upvotes: 1

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