Useful commands for Terminal.

Terminal Commands

// Move all .jpgs files to a jpg folder
mkdir jpg && mv *.jpg jpg
mkdir jpg && find . -type f -name "*.jpg" -exec mv {} jpg \;

// Show hidden files in finder
defaults write com.apple.finder AppleShowAllFiles -boolean true && killall Finder

// Hide hidden files in finder
defaults delete com.apple.finder AppleShowAllFiles && killall Finder

// Add a spacer in the dock
defaults write com.apple.dock persistent-apps -array-add '{"tile-type"="spacer-tile";}' && killall Dock

// Kill Dashboard
defaults write com.apple.dashboard mcx-disabled -boolean YES && killall Dock

// Show Dashboard
defaults write com.apple.dashboard mcx-disabled -boolean NO && killall Dock

// Play Star Wars
telnet towel.blinkenlights.nl

// View error logs live
tail -f /path/to/log

// Change computer hostname
sudo scutil –-set HostName new_hostname

// Resize multiple images
http://www.maclife.com/article/columns/terminal_101_resize_images_terminal