A handy link; bookmarked
@OP: both above are correct; ksh is avail on Linux (but may not be identical); cmds WILL vary as per Rosetta Stone (or more).
You'll want this http://linux.die.net/man/
and also www.linuxtopia.org
- a lot(!) of free to read manuals/books/HOWTOS.
If you decide to port to bash instead of ksh, try these
Given that bash is the default on Linux, it may be worth the effort, as when you ask a qn, people tend to assume bash unless you specify otherwise ...
IME, for internal cmds its easy to sw to bash; its probably based on ksh originally... for external cmds see above.
Good Luck & Welcome to LQ