Delete system apps to free up precious disk space in OS X Yosemite - http://forums.macrumors.com/showthread.php?p=20328653

yosemite_free_up_diskspace.sh

#!/usr/bin/env bash

files=(
  "/Applications/iMovie.app"
    "$HOME/Library/iMovie"

  /Applications/Photos.app
    /Users/roman/Pictures/Photos\ Library.photoslibrary
    "/Users/roman/Library/Preferences/com.apple.Photos.LSSharedFileList.plist"

  "/Applications/GarageBand.app"
    "/Library/Application Support/GarageBand"
    $HOME/Music/GarageBand

  "/Applications/Keynote.app"

  "/Applications/Pages.app"
    "$HOME/Library/Containers/com.apple.iWork.Pages"

  "/Applications/Numbers.app"

  "/Applications/iTunes.app"
    "$HOME/Music/iTunes"
    "/Library/iTunes"
    "$HOME/Library/iTunes"
    "$HOME/Library/Preferences/com.apple.iTunes.plist"
    "$HOME/Library/Preferences/com.apple.iTunesHelper.plist"
    $HOME/Pictures/iPod\ Photo\ Cache

  "/Applications/iBooks.app"

  /Applications/Chess.app
)

avail_mb() {
  df -m / | tail -1 | awk '{ print $4 }'
}

before=$(avail_mb)
for f in "${files[@]}"; do
  if [ -e "$f" ]; then
    echo "deleting $f"
    sudo rm -rf "$f" || break
  fi
done
after=$(avail_mb)
freed_up=$(ruby -e 'b,a,=ARGV.map(&:to_i); puts "%.1fGB" % [(a-b)/1024.0]' $before $after)
echo "Freed up $freed_up"