Quick OSX Tips

You can use Ctrl + Command + D to look up a word in the built-in dictionary. After you look up the initial word, let go of D and keep holding down Ctrl + Command and your Mac will look up the word under the cursor.

I find useful when using Blogger because the spellchecker doesn't work there to use the built in spellchecker in OSX. Press Command + : at in any edit field and it will take you to the next misspelled word.

Find your Mac's serial number from Terminal with the command:
ioreg -l | awk '/IOPlatformSerialNumber/ {print $4}' | sed 's/\"//g'

A lot of times I find I forget to type the sudo command when editing some config file. If you type "sudo !!" then it will sudo the last command.

Check your DNS configuration under OSX with:
scutil --dns