When I do this, it brings me straight back to Intersystems Cache documentation (which is where I started). To add, I have found things 'here and there' that actually work, but they are sparse and only pertain to 'simple' stuff, like this:
do ^%CD

do ^%FREECNT

do ^%D

do ^%T
Any thing related to classes and methods, that I find in the Cache documentation, simply won't work -  <Class does not exist>, <Method does not exist> and so on. I need a reference that contains 'useful' commands/classes, etc. that actually 'work'.

Ok. I will dig into the documentation deeper. I have my mind wrapped around Db command line and Db file processing, instead of objects, globals, tables, etc. 

Thanks for your reply Julius.

I'm not at my PC right now, but I believe I've tried all the commands, and the only one that worked was zn namespace. However, I've found a lack of comprehensive documentation on IRIS shell commands. The link you provided only offers a brief overview of ObjectScript usage, which isn't what I need. I’m looking for a complete listing of standard commands and a concise guide on working with the shell. So far, the documentation I've found only covers a few elements and lacks detailed information on command usage and examples.