How to create a Case Sensitive filesystem in 10.11.1?

How to create a Case Sensitive file system on a Mac?

Here is a simple test:

echo 'you should see this' > abc ; echo 'not just this twice' > ABC ; cat  abc ABC
you should see this
not just this twice

I'm on Mac version 10.11.1 and even with a "Case Sensitive" filesystem on a DMG image, I get:

not just this twice
not just this twice

It looks like there is a bug in the newly-rewritten Disk Utility application in El Capitan (as of 10.11.2) where it can't create case-sensitive disk images. As your answer mentioned, you can use the hdiutil command-line tool as a workaround; alternately, in Disk Utilty, you can erase the disk image after creating it, selecting a case-sensitive format.

https://discussions.apple.com/thread/7395900

I have done some digging and found a working answer.

There is a script here.

https://gist.github.com/dixson3/8360571

hdiutil create -type SPARSE -fs 'Case-sensitive Journaled HFS+' -size 60g -volname workspace ${WORKSPACE}

Proof

./workspace.sh create
./workspace.sh attach
cd /Volumes/workspace/
echo 'you should see this' > abc ; echo 'not just this twice' > ABC ; cat  abc ABC
you should see this
not just this twice