Creating Custom Short cut Keys Ubuntu 12.04

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http://askubuntu.com – I used to have my own shortcut keys to minify all the CSS and JS files for my websites after I saved the original larger version of the file. But that was on Ubuntu 11.04 and now I cannot figure out for the life of me to get the Alt + Shift + E to run my command. Anyone know what files to edit or what options screens to go through to complete this? Thanks in advance! (HowTos)