Update (global) NPM repositories, and show which repositories were updated by comparing version numbers

updateNPM.sh

npm -g ls --depth=0 > ~/before.txt
npm -g update > /dev/null 2>&1
npm -g ls --depth=0 > ~/after.txt
diff -as ~/before.txt ~/after.txt
rm ~/before.txt ~/after.txt

Options to change this script:

1. Remove the -g from lines 1-3, if you want to update a local project
2. Change line 2 to just npm -g update, to get verbose update output
3. Remove the -s parameter from line 4, to not receive the "files are identical" message
4. Change the path temporary files are saved to, by replacing ~ with the desired path
5. Remove line 5 to keep the "before" and "after" files