Thanks a lot! This one's bookmarked now.
I especially liked history expansion (starts with and contains). I can't count how many times I run a command and it needs to be run with sudo. Although I just use the arrow up key to go through the command history and type sudo if need be. But this is a time saver for sure so I don't have to go through all my history and wear out the ink on the arrow up key.
Next favorite is the alias for convenience and so appreciate the warning :)