Why aren’t new terminals that use another language? It seems so antiquated getting errors for not writing the functions in the correct order among other things.
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word “Linux” in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
I‘d say one of the primary reasons is compatibility. There is a lot of software for the Unix world that expects some kind of environment that behaves similarly to bash - imagine for instance of the bazillion of startup scripts that exist around certain tools. You’d have to be 100% backwards compatible with the bash language if you were to invent something to replace it, otherwise all those things wouldn’t work in your shell.
Why not use POSIX shell?