805Recursively removing .svn directories

When you’are working with Subversion, the situation might be familiar: You have checked-out some directories and want to check them in at another repository. Subversion is not happy to do that, it complains with a friendly reminder, that ‘your directory’ is already under version control. The proper way to do it, would probably be to export a clean directory tree, but sometimes this option is not available. Here’s a simple shell script to recursively remove all the hidden ‘.svn’ directories:
rm -rf `find . -type d -name .svn`
Wether it is better to use backticks or xargs is being discussed elsewhere.

759Creating soft symbolic links between two directories

ln -s /path/to/existing/directory /path/to/new/symbolic/link
After that, a
cd /path/to/new/symbolic/link
brings you to
Sometimes a little magic is necessary. Symbolic link can be removed with a simple ‘rm’. This only removes the symbolic link, and not the linked files.
rm /path/to/new/symbolic/link

682Remove empty array fields in PHP

array_filter WITHOUT a callback function removes ‘false’, ‘null’ and ” fields from an array.

447Stripping out NSLog() from the Release Build

Add the the *_Prefix.pch file of your projects. Strips out NSLogs, when optimized (=Release Build) Very nice solution, thanks to Marek Bell
// strip out NSLog on optimize
#ifndef __OPTIMIZE__
#    define NSLog(...) NSLog(__VA_ARGS__)
#    define NSLog(...) {}