Question

I have a Html File my.html that have links like that:

<a href="1.html">1.html</a>

How can i make batch script (for windows,BAT file) that each time a new Html file added to the folder the my.html add new line, for example after adding test.html:

 <a href="test.html">test.html</a><br/>

Answer 1

Sed¹ is perfect for such things. You can do:

sed "s#\(<a href=.*>.*</a>\)#\1</br>#g" my.html > my_out.html

Short explanation:
The Sed command looks like this: s#search_string#replace string#g

1. The s tells Sed to search and replace
2. The # is the delimiter for the Sed command (any character can be used for that).
3. The pattern for the search string is the regular expression "<a href=.*>.*</a>"
   (i.e. any string that starts with <a href= followed by >, and ends with </a>).
   The pattern is enclosed in escaped parentheses, i.e. \(pattern\). That allows Sed to remember the occurence of the string that mathces this pattern as \1.
4. The replace string is \1<br/>, i.e. the search string is replaced by itself with <br/> appended at the end.
5. The g tells Sed to repeat that for all occurrences of the search string in the file.

Hope that helps!

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¹ Sed has also been ported for Windows (see here).