http://www.perlmonks.org?node_id=43168

ybiC has asked for the wisdom of the Perl Monks concerning the following question:

I'm trying to replace all instances of img src="image.gif" with img src="/Images/image.gif" in about 100 HTML documents.   Below is what I've come up with, which creates the .bak file properly, but leaves a zero-byte edited file.   What am I overlooking?

perl -i.bak -n -e 's/img src=\"image\.gif\"/img src=\"\/Images\/image\.gif\"/g' file.html

    cheers,
    Don
    striving for Perl Adept
    (it's pronounced "why-bick")

Replies are listed 'Best First'.
Re: in-place edit, regex, one-liner
by mdillon (Priest) on Nov 24, 2000 at 01:22 UTC
    you're using '-ne', but not printing anything at the end of the evaluated code. try '-pe' or add a 'print;' to the end of your code, as appropriate.
      Woo-hoo!   -pe instead of -ne did the trick!   Thanks a bunch, mdillon.

      perl -i.bak -pe 's/img src=\"image\.gif\"/img src=\"\/Images\/image\.gif\"/g' file.html

      Here's that syntax sans toothpicks:
      perl -i.bak -pe 's///g' *.html

          cheers,
          Don
          striving for Perl Adept
          (it's pronounced "why-bick")

        I think you can cut that down a bit.

        perl -pe -i.bak 's!(img  src=")(image\.gif")!$1/Images/$2!g' *.html

        (I haven't tested it, but I think it's okay.)