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  • Sorry I don’t think i was clear that only the single file has one ‘result’ per line. The txt files within the directory have numerous lines but the string #P#only occurs one time in each file. Your example has however solved a separate issue I had with a similar issue on separate files. So thank you Commented Aug 3, 2020 at 22:04
  • @0m3rta3 That's what I assumed. Should not be a problem for my solution. Commented Aug 3, 2020 at 22:10
  • But the grep preparation wouldn’t give that kind of output. Unless I’m missing something? Which is possible. I’m using this in a couple of ways. One example is where the directory of files are puppeteer scripts. The 2nd column of the single file are various URLs (all different). I then place an uncommon string (#P#) everywhere I want a URL inserted and then loop the list to insert each url into each script. So each script has different calls and different URLs. This is just an example one of the things I’m trying to do. Commented Aug 3, 2020 at 22:16
  • URL’s might not be the best example because I don’t have to worry about escaping special characters in the majority of my cases. It’s just a simple replace(this)-with(that) Commented Aug 3, 2020 at 22:28
  • @0m3rta3 The grep is just supposed to show to readers what my files look like so that my code can easily be tested. The sed should change just the one respective line in a multi-line file. Have you tried that at all? Of course, the sed call needs a separator char which does not appear in your URLs or you will get into quoting hell. Commented Aug 3, 2020 at 22:35