Retrieve CPU usage and memory usage of a single process on Linux?

Question

I want to get the CPU and memory usage of a single process on Linux - I know the PID. Hopefully, I can get it every second and write it to a CSV using the \'watch\' command

Answer 1

ps axo pid,etime,%cpu,%mem,cmd | grep 'processname' | grep -v grep

PID - Process ID

etime - Process Running/Live Duration

%cpu - CPU usage

%mem - Memory usage

cmd - Command

Replace processname with whatever process you want to track, mysql nginx php-fpm etc ...