Nexus Tools is an installer for the Android debug/development command-line tools ADB (Android Device Bridge) and Fastboot for Mac OS X, Linux, and Google Chrome/Chromium OS. The script does not need to be downloaded, simply copy and paste this command into the terminal and run it to install Nexus Tools:
bash <(curl https://raw.githubusercontent.com/corbindavenport/nexus-tools/master/install.sh)
bash <(curl https://raw.githubusercontent.com/corbindavenport/nexus-tools/master/uninstall.sh)
Support for Google Chrome OS is experimental at this time, as I was only able to test it on a build of Chromium for x86 PCs. I don't have an actual Chromebook to test it on, but Nexus Tools should work correctly on both x86 and ARM Chromebooks.
Nexus Tools requires sudo privileges to install/uninstall the adb and fastboot tools to /usr/bin, so they can be run without typing the full directory. Nexus Tools is licensed under the GPLv3 license.
XDA News Article