Thank you, BASH, for making me lazy. I wrote a quick script to update WordPress when I tell it to. Weighing in at a hefty 30 lines, the script will download the latest copy of WordPress and overwrite (after seeking your permission) your existing installation when you invoke it. Just fill in the first three variables with your own data and run it.
[joeyjwc@jupiter public_html]$ ./wp-upgrade.sh --20:07:12-- http://wordpress.org/latest.tar.gz Resolving wordpress.org... 188.8.131.52, 184.108.40.206 Connecting to wordpress.org|220.127.116.11|:80... connected. HTTP request sent, awaiting response... 200 OK Length: unspecified [application/x-gzip] Saving to: `wordpress-2.3.1.tar.gz' [ <=> ] 883,535 --.-K/s in 0.1s 20:07:13 (8.37 MB/s) - `wordpress-2.3.1.tar.gz' saved  Latest WordPress code downloaded. Now copying code to: /home/joeyjwc/www/blog Press q to cancel. Copied. If there have been major changes, you might need to run: http://blog.jwcxz.com/wp-admin/upgrade.php