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Point Of View Blog
CDPATH Bash completion in OSX

Setting the CDPATH environment variable saves you having to cd to commonly-used parent directories. I usually put my main workspace directory in there to allow direct directory changes to project dirs, as well as ‘..’ to allow jumping to sibling …

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Standup 12/17/2010 Comparing indexed date columns, git subtrees, Headless Selenium for CI


Is there a way to get MySql indexing to speed up queries involving greater and less than operators on date columns?

Postgres handles these operators a little bit better than MySql, but may not actually solve this problem.

Using millis instead of dates would give the DB the best chance of handling this scenario.

We are using Git's subtree merge facility instead of submodules to stay synced to a different repository for part of our project. How do we push changes back to that repo?

See Tim Connor's blog post "Git sub-tree merging back to the subtree for pushing to an upstream". Early in that post is a pointer to an article describing the the subtree merge operation. Tim goes on to explain how to push your changes back through the chain.


  • Some cloud environments leave the names of temp files visible even when their contents are not accessible. Be sure to use obfuscated names for your temporary files!

  • The "Headless" gem allows you to easily set up an alternate "display" that allows programs to execute in a headless environment. See this blog post about how to use Headless to run Selenium tests on a CI box:

  • Ccrb will bog down to painfully slow levels if more than a couple of CC Tray clients are pinging it repeatedly during a build.

  • Cron will not honor your .rvmrc file unless you do some work to set up the environment. If you set up your cron job like this:

0 6 * * * /bin/bash -l -c 'echo /home/someuser/.rvm/bin/rvm rvmrc trust ... && cd ... 

the -l & -c parameters cause bash to load your environment as if your were logging in before running the specified commands. Someone also mentioned that rvm-shell can be used as a solution to this problem.

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