The main distribution is available on Aminet in the archive
util/shell/ZShell28.lha

Description:
 ZShell is a small (34K), fast and powerful Shell with many (66)
 built-in commands. So it replaces most of the commands in the C:
 directory (like LIST, COPY etc.) which saves disk space and
 reduces disk accesses. There is NO way around ZShell for those
 who do not have a hard disk or still have Kickstart 1.2/1.3 !

 But it is very useful for those with a better Kickstart and/or
 hard disk, too, because for example it has powerful editing &
 history, filename completion, pipes, review buffer, some
 Kickstart 2.0/3.0 specific features and a lovely LIST command.

 I have tried to make ZShell compatible to the standard shell, not
 just another UN*X shell clone, but with some features known from
 UN*X shells. I especially have taken care that it is easy to use.

 ZShell is very useful for programmers, because it has things like
 showing EXEC-lists and the task list, memory dumping and other
 things you usually find in debuggers.

 You can switch off the internal command-line-editor to use
 ZShell with console handlers like KingCON.

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                 1441    3039  47.4% -lh5- 7d8c Sep 13  1995 ReadMe
[generic]                 5091   13230  38.5% -lh5- 4277 Jan  2  1995 zsh.s
[generic]                81111  256986  31.6% -lh5- 6b3e Sep 13  1995 ZShell.S
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         3 files   87643  273255  32.1%            Sep 15  1995