help with sed

**kern_eye** · 01-12-2008

I have a file something like this
<html><head><meta http-equiv="content-type" content="text/html; charset=UTF-8"><title>Google</title><style>body,td,a,p,.h{font-family:arial,sans-serif}.h{font-size:20px}.h{color:#3366cc}.q{color:#00c}.ts td{padding:0}.ts{border-collapse:collapse}#gbar{float:left;font-weight:bold;height:22px;padding-left:2px}#gbh{border-top:1px solid #c9d7f1;font-size:0;height:0;position:absolute;right:0;top:24px ;width:200%}#gbi{background:#fff;border:1px solid;border-color:#c9d7f1 #36c #36c #a2bae7
..............................................
I want to add newline before each html beginning tag and after each html ending tag, so it would look like this :
<html>
<head>
<meta ......>..........</meta>
Any ideas how to do this using sed?

**ghostdog74** · 01-12-2008

Code:

awk '{ sub(/<html>/,"<html>\n"); 
       sub(/<\/html>/,"<\/html>\n");
       print}' file

it will be similar using sed.

**wje_lf** · 01-12-2008

As kern_eye made clear with his example, he wants to do this with all HTML tags, not just <HTML> tags.

Here ya go:

Code:

sed -e 's/\(<[a-zA-Z]\)/\
\1/g' -e 's/\(<\/[^>]*>\)/\1\
/g' 1.dat

Be sure that a newline immediately follows the backslash you see at the end of each of the first two lines. If you're putting this in a script, you ought to be able to just cut and paste. If you're typing this at the bash prompt, the opening single quote following each -e will signal to bash that you're not done with the command, and bash will let you continue entering more of the command on the next line.

Hope this helps.

**scm** · 01-13-2008

Since you're enclosing the entire matched pattern each time, you could avoid using the \( and \) and use & in the replacement string instead of \1.

**wje_lf** · 01-13-2008

I didn't know that. Thank you. It works even on my ancient version of sed (3.02).

**scm** · 01-14-2008

It's been in every version since (to my knowledge) the 1980s, I believe, so you'd need a version that predates that to find one that didn't support it! The \( \) was presumably added subsequently to allow replacement of partially matched patterns.

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