Shell Programming and Scripting

Hello,

I am hoping someone can provide some guidance on using context based search and replace to search for a pattern and then do a search and replace in the line that follows it. For example, I have a file that looks like this:

<bold>bold text
</italic>
somecontent
morecontent
<italic>italic text
</italic>
somecontent
morecontent
<bold>bold text
</italic>

Basically, I'd like to look for lines containing the <bold> tag, and then search and replace the </italic> tag with the proper closing </bold> tag. The goal is not to disturb the tags that should remain italic.

<bold>bold text
</bold>

I'm not married to doing this with sed, but it would be great to have a simple one-liner to accomplish this. For ex, I've attempted to do this using something like:
sed '/<bold>/,+1 s/<\/italic>/<\/bold>/g'
But I am not sure that my syntax is correct.

Appreciate the help.
Thanks.

Based on your sample data:

Code:

sed '/<\/italic>/d;/<bold>/s:$:</bold>:;/<italic>/s:$:</italic>:' input_file

Code:

sed 'N;s/\n/ /;P;D;' filename | sed 's/bold text <\/italic>/bold text<\/bold>/g'

A slightly more generic version in perl

Code:

perl -pe '$i=1 if m+<italic>+;if(m+</italic>+) { if($i != 1) {s+</italic>+</bold>+} else {$i=0}}' input_file