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Full Discussion: Can sed replace every 2 instances it finds in a file? Pattern.
Top Forums Shell Programming and Scripting Can sed replace every 2 instances it finds in a file? Pattern. Post 302401669 by alister on Sunday 7th of March 2010 09:41:24 AM
Old 03-07-2010
Quote:
Originally Posted by Franklin52
I had something similar to that in mind with a mod operator but with NR:
Code:
awk '/PORT/ && gsub("PORT",i){i+=!(NR%n)}1' i=4000 n=3 file

Regards
NR won't work in this case, though. NR will increment for every line regardless of whether a PORT substituion occured. The "substitution" counter needs to be something independent of NR (j in my version).

On an unrelated note, since gsub returns the number of substitutions made, we can further reduce the code to:
Code:
awk 'gsub(/PORT/,i){i+=!(++j%n)}1' i=1 n=2 file

Like the earlier versions of this approach, it treats multiple substitutions on a single line as one. That's probably a bug. Though if we can be certain that only one instance of PORT will occur on a line, then it's fine, and as a bonus we can reduce by one more character:

Code:
awk 'sub(/PORT/,i){i+=!(++j%n)}1' i=1 n=2 file

And that concludes this episode of OCD AWKing. Thank you for tuning in. Smilie

Cheers,
Alister
Last edited by alister; 03-07-2010 at 10:52 AM..
 

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