How to run a command in linux and use its output in another command?

Question

I want to subtract from the output of the nproc command and run another command using the calculated value.

The following doesn't work in linux:

somecommand --set_cpus = (nproc - 1)

Answer 1

You can try like this:

somecommand --set_cpus = `expr $(nproc) - 1`