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<title>Treesed Usage</title>
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<h3>How to Use Treesed</h3>

Go to the directory where you want to search or make changes.  

<p>
There are two choices you can make when using treesed:
</p><ol>
<li>Do I just want to search for a text, or do I want to search for a
text and replace it with something else?  
<br>
If you are just searching you are using Treesed in "search mode", otherwise it is in
"replace mode."
</li><li>Do I want to search/replace only in files in my current directory,
or should files in all subdirectories (and all directories below that)
also be done?
</li></ol>
Some examples will make this clear.

<h4>Searching</h4>
Say you are faced with the situation that the author of a slew of web-pages, Nathan Brazil, has left and has been succeeded by Mavra Chang.  First, let us see which files are affected by this (what you type in is shown in <b><tt>bold</tt></b>):
<blockquote>
<pre>[localhost] <b>treesed "Nathan Brazil" -files *.html</b>
search_pattern: Nathan\ Brazil
replacement_pattern: 

** Search mode

.
midnight.html: 1 lines on: 2
..
well.html: 1 lines on: 3
</pre>
</blockquote>
We notice the following:
<ul>
<li>The search text <tt>"Nathan Brazil"</tt> is enclosed in
double-quotes (<tt>"</tt>).
</li><li>You specify which files to search with <tt>-files</tt> followed by a
list of file names--in this case <tt>*.html</tt>.
</li><li>Treesed reports the search pattern ("pattern" is just a fancy word
for "text") you specified (you can ignore
that \).
</li><li>Treesed reports an empty <tt>replacement_pattern</tt>.  This is
correct, because you haven't entered one.
</li><li>It therefore deduces that is is in search mode.
</li><li>It finds two files containing "Nathan Brazil", and reports on which
lines of these files it found it; it does not show the lines themselves.
</li></ul>
Because you used <tt>-files</tt>, Treesed will search in the files you
specify <i>in the current directory</i>.  You can also search files in
the current directory <i>and</i> all directories below it.  However, in
that case you can not specify which file names to use, all files will be
searched:
<blockquote>
<pre>[localhost] <b>treesed "Nathan Brazil" -tree</b>
search_pattern: Nathan\ Brazil
replacement_pattern: 

** Search mode

.
midnight.html: 1 lines on: 2
...
well.html: 1 lines on: 3
.
new/echoes.html: 1 lines on: 2
</pre>
</blockquote>
We notice the following:
<ul>
<li>Instead of <tt>-files</tt> we now see <tt>-tree</tt>.
</li><li>We do not see a specification of file names.
</li><li>Treesed finds an occurence of "Nathan Brazil" in the file
<tt>echoes.html</tt> in the subdirectory <tt>new</tt>; it did not
find this file in the previous example (as it shouldn't).
</li></ul>

<h4>Replacing</h4>
To replace a text you simply add the replacement text right after the
search text:
<blockquote>
<pre>[localhost] <b>treesed "Nathan Brazil" "Mavra Change" -files *.html</b>
search_pattern: Nathan\ Brazil
replacement_pattern: Mavra Chang

** EDIT MODE!

.
midnight.html: 1 lines on: 2

Replaced Nathan\ Brazil by Mavra Chang on 1 lines in midnight.html
..
well.html: 1 lines on: 3

Replaced Nathan\ Brazil by Mavra Chang on 1 lines in well.html
</pre>
</blockquote>
We notice the following:
<ul>
<li>Right after the search text "Nathan Brazil" you specify the
replacement text "Mavra Chang".
</li><li>As a result, Treesed now reports a non-empty
<tt>replacement_pattern</tt>.
</li><li>Hence it concludes it is in "edit mode", which means replacment mode.
</li><li>Treesed dutifully reports on which lines in which files it did the
replacement.
</li></ul>
To replace a text in all files in the current directory and the ones
below it, we do the following:
<blockquote>
<pre>[localhost] <b>treesed "Nathan Brazil" "Mavra Chang" -tree</b>
search_pattern: Nathan\ Brazil
replacement_pattern: Mavra Chang

** EDIT MODE!

.
midnight.html: 1 lines on: 2

Replaced Nathan\ Brazil by Mavra Chang on 1 lines in midnight.html

....
well.html: 1 lines on: 3

Replaced Nathan\ Brazil by Mavra Chang on 1 lines in well.html
.
new/echoes.html: 1 lines on: 2

Replaced Nathan\ Brazil by Mavra Chang on 1 lines in new/echoes.html
</pre>
</blockquote>
and we get the expected results, including the replace in
<tt>new/echoes.html</tt>.

<h4>Old Versions</h4>
Treesed leaves behind quite a mess of old versions of the files it
changed (only in change-mode, of course).  These old files have the same
name as the original file, with <tt>.ddddd</tt> appended to it.  For
example, if treesed makes a change to <tt>midnight.html</tt> it will
leave the original version as something like
<tt>midnight.html.26299</tt>.  You'll have to remove these files lest
your disk area clutters up.  Here is a command that does that, <b>but
beware!</b>  This command removes all files in the current directory and
all below it, that end in a period followed by one or more 
digits:
<blockquote>
<pre>find . -name "*.[0-9]*" -exec rm {} \;
</pre>
</blockquote>

It is interesting to note that if you use treesed again without cleaning
up, you may get files like <tt>midnight.html.26299.27654</tt>.  These
will also be cleaned up by the above slightly dangerous command.


<h3>About Treesed</h3>
<tt>treesed</tt> is public domain software developed
and designed by Rick Jansen from Sara, Amsterdam, Netherlands, January
1996.

<p>

<h3>About This Document</h3>
This usage document was created by the Division of Information Technology Services at The
University of Western Ontario.

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