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  • Does grep load all file in memory as well? Commented Apr 3, 2014 at 12:44
  • grep works on one line at a time, so it doesn't load the whole file but can load some big chunks if the input isn't text. Commented Apr 3, 2014 at 12:45
  • I've tried grep -o --byte-offset... to get the offset of the exact word (this is what I need), but i get no output. (The word is there I'm sure). Commented Apr 3, 2014 at 12:47
  • Is maybe some encoding issue related? It is MOBI e-book file. It is a binary file, with some text content here and there Commented Apr 3, 2014 at 12:47
  • 1
    +1 Perl method is excellent for recent OS X which includes grep 2.5.1, which has a bug that returns always 0 for --byte-offset. I subtracted length($matchString) rather than 1 to get the offset at the start of string rather than end. Commented Jan 31, 2016 at 13:28