* Added a README and signed the script for security reasons.

.gitignore

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 /nginx_dissite
+/nginx_ensite.sig

README.org

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+* nginx_ensite and nginx_dissite for quick virtual host enabling and disabling
+
+** Description
+
+This is a shell (Bash) script that replicates for [[http://wiki.nginx.org][nginx]] the [[http://debian.org][Debian]]
+=a2ensite= and =a2dissite= for enabling and disabling sites as virtual
+hosts in Apache 2.2.
+
+The original =a2ensite= and =a2dissite= is written in
+Perl. =a2dissite= is a symbolic link to =a2ensite=. Here I followed
+the same approach, i.e., =nginx_dissite= is a symbolic link to
+=nginx_ensite=.
+
+** Installation 
+
+Just drop the script and the symbolic link in =/usr/sbin= or other
+location appropriate for your system. Meaning: =cp nginx_* /usr/sbin=.
+That's it you're done. 
+
+Note that the script assumes a specific file system topology for your
+=nginx= configuration. Here's the rundown:
+
+1. All virtual hosts configuration files should be under
+   =/etc/nginx/sites-available=. For example the virtual host
+   =foobar= is configured through a file in =/etc/sites/available=. 
+
+2. After running the script with =foobar= as argument: =nginx_ensite
+   foobar=. A symbolic link =/etc/nginx/sites-enabled/foobar ->
+   /etc/nginx/sites-available/foobar= is created.
+
+3. The script invokes =nginx -t= to test if the configuration is
+   correct. If the test fails no symbolic link is created and an error
+   is signaled.
+
+4. If everything is correct now just reload nginx, in Debian based
+   systems that means invoking =/etc/init.d/nginx reload=.
+
+5. Now point the browser to the newly configured host and everything
+   should work properly assuming your configuration is sensible.
+
+6. To disable the site just run =nginx_dissite foobar=. Reload nginx
+   to update the running environment.
+
+
+** Requirements
+
+The script is written in Bash and uses what I believe to be some Bash
+specific idioms. I never tested it in other shells. You're welcomed to
+try it in any other shell. Please do tell me how it went. 
+
+It requires also [[http://en.wikipedia.org/wiki/AWK][awk]]. The original =AWK= (usually called BWK awk) from
+Bell Labs will do if you don't have [[http://www.gnu.org/software/gawk/][gawk]] (Gnu awk).  IN OS X and *BSD
+the former is the default =awk=. The script should work in *BSD, OS X
+and GNU/Linux.
+
+
+** Security & Trust
+
+The script is signed with my GPG key. Just do =gpg --keyserver
+keys.gpg.net --recv-keys 4D722217=. Verify by issuing =gpg --verify
+nginx_ensite.sig=.