Open Google Chrome in Kiosk Mode on Mac

set strUrl to ""
do shell script "/Applications/Google\\\\ Chrome --app=" & strUrl tell application "Google Chrome" to activate
tell application "System Events"
keystroke "f" using {command down, control down}
end tell

Remove all .DS_Store files

.DS_Store  files aren't much of a problem to your Mac, these small files provide information about how you want to see the directory laid out, the position of icons within the folder. However, if they disturb your chi you can remove them recursively from /  using the following command:

sudo find / -name ".DS_Store" -depth -exec rm {} \;

These files will of course be regenerated whenever you enter a directory without one via Finder.

Rebuild Spotlight Index on Mac OS X

Sometimes after several months Spotlight doesn't work very efficiently and starts to slow down your Mac. Fortunately there's a way to reset the Spotlight Index so that it reindexes your drives which may also lead to a smaller index file size.

Just open Terminal via Spotlight or go to Applications > Utilities > Terminal and copy in the following:

sudo mdutil -E /

This will clear everything from Spotlight and the reindex will start immediately.

If you're having problems (or suspect you're having problems) with a particular drive you can reindex only that drive by using the following command:

sudo mdutil -E /Volumes/[DriveName]

Just replace [DriveName] with the actual path or omit the path; drag and drop the drive from Finder to insert it.

You can exclude drives from Spotlight by going to System Preferences > Spotlight > Privacy.

Recursive chmod only on directories

Run find on -type d (directories) with the -exec primary to perform the chmod only on folders:

find /your/path/here -type d -exec chmod o+x {} \;

To be sure it only performs it on desired objects, you can run just find /your/path/here -type d first; it will simply print out the directories it finds.