Note that absolutely none of this is authoritative or directly based on relevant documentation. It’s mostly what I found and figured out and guessed and (in some cases) made up. Some of it may be wrong or dangerous or lead to disaster or confusion. I am not taking responsibility here for anything. Read and act on it at your own peril!

Showing all files in all subdirectories in order of last write time, newest last. Probably.

Bash (Linux)

find "$(pwd)" -type f -printf '%TY-%Tm-%Td %TH:%TM:%TS %p\n' | sort

DCL (OpenVMS)

DIRECTORY [...]*.*;* /FULL /DATE=MODIFIED /SORT=DATE

PowerShell (Windows)

Get-ChildItem -Recurse -File | Sort-Object LastWriteTime | Select-Object LastWriteTime, FullName

This is what people mean when they are talking about why their favourite command line shell is superior to other shells.

And if you find PowerShell or DCL too wordy (or too readable), you can do this:

PowerShell (using aliases and abbreviations)

gci -r -fi | sort LastWriteTime | select LastWriteTime,FullName

DCL (using abbreviations and despacing)

DIR[...]*.*;*/F/D=M/S=D

Next: TBD