Revert committed change in Subversion

For whatever reason, maybe just committed unexpected change accidentally into SVN repository like me today, you want to revert the files to last or any previous version. The best solution is to use svn merge command. For example, you hope to change “world.txt” from current revision 2012 to 2011, you could do:

# be sure you've updated
$ svn up

# run any of the following equivalent commands
$ svn merge -c -2012 path/to/world.txt
$ svn merge --change -2012 path/to/world.txt
$ svn merge --r 2012:2011 path/to/world.txt
$ svn merge --revision 2012:2011 path/to/world.txt

# of course, don't forget committing the change
$ svn commit -m "revert change committed in r2012"

The world is safe now.

References

Markdown Syntax Quick Reference

Markdown is a lightweight markup language, originally created by John Gruber and Aaron Swartz allowing people “to write using an easy-to-read, easy-to-write plain text format, then convert it to structurally valid XHTML (or HTML)”.
- Wikipedia

Block elements

Paragraphs and line breaks

A paragraph is one or more consecutive lines, separated by blank line. To insert a <br />, end a line with two or more spaces.

Headers

Setext-style

Markdown:

This is an H1
=============
This is an H2
-------------

HTML:

<h1>This is an H1</h1>
<h2>This is an H2</h2>

Atx-style

Markdown:

# This is an H1
## This is an H2
### This is an H3
#### This is an H4
##### This is an H5
###### This is an H6

HTML:

<h1>This is an H1</h1>
<h2>This is an H2</h2>
<h3>This is an H3</h3>
<h4>This is an H4</h4>
<h5>This is an H5</h5>
<h6>This is an H6</h6>

Blockquotes

Markdown:

> ## This is a header.
> 
> 1.   This is the first list item.
> 2.   This is the second list item.
> 
> Here's some example code:
> 
>     return shell_exec("echo $input | $markdown_script");
>
> This is the first level of quoting.
>
> > This is nested blockquote.
>
> Back to the first level.

HTML:

<blockquote>
  <h2>This is a header.</h2>
<ol>
<li>This is the first list item.</li>
<li>This is the second list item.</li>
</ol>
<p>Here's some example code:</p>
<pre><code>return shell_exec("echo $input | $markdown_script");
</code></pre>
<p>This is the first level of quoting.</p>
<blockquote>
  <p>This is nested blockquote.</p>
</blockquote>
<p>Back to the first level.</p>
</blockquote>

Lists

Unordered lists use asterisks *, pluses +, or hyphens -

Markdown:

*   Red
*   Green
*   Blue

HTML:

<ul>
<li>Red</li>
<li>Green</li>
<li>Blue</li>
</ul>

Ordered lists

Markdown:

1.  Bird
2.  McHale
3.  Parish

HTML:

<ol>
<li>Bird</li>
<li>McHale</li>
<li>Parish</li>
</ol>

Code blocks

To produce a code block, indent every line of the block by at least 4 spaces or 1 tab.

Markdown:

    tell application "Foo"
        beep
    end tell

HTML:

<pre><code>tell application "Foo"
    beep
end tell
</code></pre>

Horizontal rules

Markdown:

* * *
***
*****
- - -
__________________________________

HTML:

<hr />
<hr />
<hr />
<hr />

Span elements

inline-style

Markdown:

This is [an example](http://example.com/ "Title") inline link.

[This link](http://example.net/) has no title attribute.

HTML:

<p>This is <a href="http://example.com/" title="Title">an example</a> inline link.</p>
<p><a href="http://example.net/">This link</a> has no title attribute.</p>

reference-style

Markdown:

This is [an example][id] reference-style link.
[id]: http://example.com/  "Optional Title Here"

HTML:

<p>This is <a href="http://example.com/" title="Optional Title Here">an example</a> reference-style link.</p>

Markdown:

Visit [Daring Fireball][] for more information.
[Daring Fireball]: http://daringfireball.net/

HTML:

<p>Visit <a href="http://daringfireball.net/">Daring Fireball</a> for more information.</p>

Emphasis

Markdown:

*single asterisks*
_single underscores_
**double asterisks**
__double underscores__

HTML:

<p><em>single asterisks</em></p>
<p><em>single underscores</em></p>
<p><strong>double asterisks</strong></p>
<p><strong>double underscores</strong></p>

Code

Markdown:

Use the `printf()` function.

HTML:

<p>Use the <code>printf()</code> function.</p>

Images

inline-style

Markdown:

![Alt text](/path/to/img.jpg "Optional title")

HTML:

<p><img src="/path/to/img.jpg" alt="Alt text" title="Optional title" /></p>

reference-style

Markdown:

![Alt text](/path/to/img.jpg)

![Alt text](/path/to/img.jpg "Optional title")

HTML:

<p><img src="/path/to/img.jpg" alt="Alt text" title="" /></p>

<p><img src="/path/to/img.jpg" alt="Alt text" title="Optional title" /></p>

Miscellaneous

Markdown:

<http://example.com/>

HTML:

<p><a href="http://example.com/">http://example.com/</a></p>

Backslash escapes

The following characters could be escaped:

\   backslash
`   backtick
*   asterisk
_   underscore
{}  curly braces
[]  square brackets
()  parentheses
#   hash mark
+   plus sign
-   minus sign (hyphen)
.   dot
!   exclamation mark

Markdown:

\*literal asterisks\*

HTML:

<p>*literal asterisks*</p>

References

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