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line 28 : modified the regexp to also match if the optional '#' caracter is present to comment the line, like it was by default on my Debian:9 official based image. line 28 : modified the regexp by adding the 'g' end caracter, just for better readability for beginners like me. line 31 : modified the order between option '-i' and the regexp argument, just for better readability for beginners like me.