There are many ways to check Linux running processes. The “easy” ways: use small utilities like top or atop. The more powerful but more complex way to use internal linux ps command.
So to install either top or atop simply time this command. Be sure that these utilities already installed. For instance atop is usually not installed by default but supplies in most Linux distribution. In Debian for example.
Once it’s installed simply type atop
to use top command, simply type top.
If for some reason this is not enough for you, you can use ps command. ps -A will list you all processes currently running on your Linux system
Another utility which is my favorite is htop. Note that it should be also installed (similar way as atop)