sys.cmd should also return the ouput of the cmd

Dorkus

I wanted to make a GUI for FFmpeg and FFmpeg has a lot of console logs and commands id like to document in the UI. But as far as I can tell sys.cmd doesnt let you see the output of the command, only if the command was successful. Itd be nice if also returned the output as a string for example which can then be displayed in the UI or console

Example:
Running sys.cmd("python -V") will only return true. Ideally, I'd like for this to actually return the outputted text(the python version in this case)
The code could look something like this:
local isSuccess, ouput = sys.cmd("python -V"); if isSuccess then print(output) end
The result would of course, print the appropriate output:
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Samir

Dorkus
sys.cmd() is just a fast way to execute and launch other programs.
If you need to get output, you should use a sys.Pipe() instead.

Dorkus

Samir Can you provide an example? Im reading the docs but Im still confused.

Code:
local pipe = sys.Pipe("python -V"); print(pipe:read())

Output: Task: 000001EA4F45E380

Edit: I copy and pasted the code from the Pipe:read() example to see what would happen, expecting it to either show the output or show a similar output to above, but instead it actually error-ed instead.
attempt to index a nil value (local 'pipe'). The only additions i added to the example code was requiring the console and ui, the rest of the code is same. Strange for it to error, so possibly a bug.

Samir

Yes Pipe uses Tasks since LuaRT 1.7.0
It might be a bug I will check this thank you for this report

Samir

Ok it was just the Pipe examples that were not updated since LuaRT 1.7.0.
It will be fixed in next LuaRT release