[Raion]

So ksh and bash do not generally have the same export syntax.

Mksh even moreso, so you'll need to familiarize yourself with mksh:

https://manpages.ubuntu.com/manpages/tru...ksh.1.html

It should be noted on IRIX the default interactive shell is usually csh or tcsh, and depending on what functionality you use in GNU Bash or KSH88/MKSH, you may find it faster to just use tcsh.

For instance, the main things that I used to use for Bash when I was a Linux user have similar conventions:

Directional history (i.e. using up/down to cycle through old commands, same as bash)
Tab completion of commands and paths
Colored prompts (have to use older syntax for it)
Execute prior command argument (ESC+. In Bash, but append !$ to tcsh)

But again, use what you're comfortable with, and I can appreciate the need for performance. bash is slower than a dog.