Is it possible to mangle a Bash script such that it becomes unreadable by any human? If so, can it be de-mangled? Or, can I view what commands are being executed when I run the script?
Code obfuscation is just a layer of false sense of security. You could learn and write the code in a c or c++ language that is compiled. Plus, if you can deobfuscate it, then probably someone else will.
Nevertheless, some obfuscation scripts are mentioned here:
On the other hand, you could set up the script permissions so that it cannot be read by other users except for the root (or setup the sudoers file and configure it with sudo).