(#|$) match a hash mark, or alternatively, the end of a line.\s* - match whitespace (tabs and spaces) if any.'^\s*(#|$)' - a regular expression matching comments and empty lines.
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Since there is no answer so far explaining how to use the -I option correctly, I'll provide an alternative which works in bash shells: diff -u -B <(grep -vE '^\s*(#|$)' test1) <(grep -vE '^\s*(#|$)' test2) $ # comparing files with both comment and regular changes The commands: $ # comparing files with comment-only changes So, how should this option be used? How can I make diff skip certain lines (in my case, comments)? Please do not suggest greping the file and comparing the temporary files.Īccording to Gilles, the -I option only ignores a line if nothing else inside that set matches except for the match of -I. This seems to match the comments, but it does not work for diff -I '#.*' file1 file2. Literally putting the line ( Port 631) as RE does not match anything, neither does it help to put the RE between slashes.Īs suggested in “diff” tool's flavor of regex seems lacking?, I tried grep -G: grep -G '#.*' file I tried the -ignore-matching-lines=RE ( -I RE) option of GNU diff 3.0, but I couldn't get it working with that RE. The (simplest) regular expression skipping the first requirement would be #.*.
How can I run diff on the configuration files, skipping the comments? A commented line is defined by: I've added some comments to describe behavior. I've two configuration files, the original from the package manager and a customized one modified by myself.
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