Similar to this thread, I have a remote machine with 8 cores that I want to use for running scripts in parallel (1 script per core at a time).

However, I don't have multiple bash scripts but a single Python3 script that I want to run with different inputs. I tried parallel python3 -c main.py input*, parallel -j 100% python3 -c main.py ::: input*, and parallel python3 main.py input* but nothing worked.

The exact error message is:

parallel: Error: -g has been retired. Use --group.
parallel: Error: -B has been retired. Use --bf.
parallel: Error: -T has been retired. Use --tty.
parallel: Error: -U has been retired. Use --er.
parallel: Error: -W has been retired. Use --wd.
parallel: Error: -Y has been retired. Use --shebang.
parallel: Error: -H has been retired. Use --halt.
parallel: Error: --tollef has been retired. Use -u -q --arg-sep -- and --load for -l.

I don't understand how this is related to my input. I didn't use any of these options.

I'm fairly new and inexperienced with Unix and couldn't get it to work myself or with googling. Any help is appreciated. Do I have to write a shell-script to help me with that?