Fix POSIX compatibility

[kieranpotts]

Example: using echo -e (which is a Bashism) where should be using POSIX-compliant printf.

Test all aliases, functions and Git aliases on Ubuntu/WSL.

References:

• https://linuxize.com/post/bash-printf-command/
• https://pubs.opengroup.org/onlinepubs/9699919799/utilities/printf.html