Which command entered without arguments is used to display a list of processes running in the current shell

ps

Explanation:

In Unix and Unix-like operating system, the command used to display the list of processes running in the current shell is ps. For each of these processes, the following details are displayed;

i. PID which indicates the id of the process

ii. TTY which indicates the type of terminal from which the process is running.

iii. TIME which represents the CPU time consumed by the the process and its sub-processes.

iv. CMD which represents the command that runs as the current process.

that without the operating systems you would have to control and synchronize computer hardware.