Compare the differences between two files?

Put the files into a folder and add the folder to the Sublime Text sidebar.

You should now be able to select both files in the sidebar (or the folder) and with a right click select the ‘Diff’ option.

Select columns?

Using the Mouse

OS X

• Left Mouse Button + Option
• OR: Middle Mouse Button

• Add to selection: Command
• Subtract from selection: Command+Shift

Windows

• Right Mouse Button + Shift
• OR: Middle Mouse Button

• Add to selection: Ctrl
• Subtract from selection: Alt

Using the Keyboard

OS X

• Ctrl + Shift + Up
• Ctrl + Shift + Down

Windows

• Ctrl + Alt + Up
• Ctrl + Alt + Down