This adds your ssh public key to the authorized_keys on a remote server. The key file in the snippet is called id_dsa.pub, yours may have another name but this is standard for DSA encryption.

To learn more about ssh I heartly recommend this: SSH tips and tricks

Recursively removes files or directories with a given name, using find.

I most frequently use it to remove 'CVS' or '.svn' directories from sourcepackages that still have the versioning information in them.

Load images more quickly in a web page by having the browser cache them before they are requested by the user.

This script specifies the location of images that share a common folder. It can be used for multiple images and folders.

This method uses less code and is more maintanable than specifying the location of each image individually.