While poking around in Picotron, I found myself wanting to view the contents of a file without opening it in the editor (via the edit command), so I wrote a little cat function. In order to implement it I needed to grab the current working directory so I went ahead and implemented a pwd command as well. Both of these are very simple and really just wrap existing Picotron functions for ease of use in the command line.

-=cat=-

local argv = env().argv
local foldr = env().path

if #argv < 1 or #argv > 1 then
    print("usage: cat filename")
else
    local f = foldr.."/"..argv[1]
    print(fetch(f))
end

-=pwd=-

local foldr = env().path

print(foldr) 

To implement these, just save each in it's own project in the /appdata/system/util folder, using the name of each command as the filename- so copy the code for cat into 'main.lua' and cd into /appdata/system/util and type save cat. Same goes for pwd. Once you do this, you can run them straight from the Picotron command line.

Hope these are helpful to someone else :). Thanks to @Hessery and @scrapSavage for introducing me to the fetch function!

pwd() is actually built-in!
You can give it a go in the terminal with ?pwd() or in any cartridge.

Ah, so it is! And printing output with ? is a great timesaver! I totally forgot about that in Pico-8. Thanks for that and for the heads up :)

Yep!
Not to mention (though it is nice to have a shortcut, like in your case) cat can be achieved with
?fetch("file")