korn shell

 Name                    Last modified      Size  Description
 Parent Directory                             -   
 learning/               2021-05-27 00:12    -   
 quickstart/             2021-05-27 00:14    -   
 profile                 2021-06-02 21:20  113   
 kshrc                   2021-06-03 01:21  326   

https://github.com/ksh93/ksh

https://github.com/att/ast


in some use cases, mksh could be much more practical (not 
the original real thing, though:

  "...mksh implements many, but by far not all, ksh93
  features, but most ksh88 features. No floating point.
  All commands of a pipeline are executed in a
  subshell."

also interesting:

  "However if you are under the illusion that ksh93 and
  ksh from solaris 10 or earlier are compatible, think
  again. After writing around 2000 lines that made
  copious use of the typeset command, I just had to
  throw it away and start again in perl. The switches
  to that command in particular are very different."

)