[SOLVED] Unable to get the cpu and memory usage using process id

Issue

I am trying to get the process id in PID and then get the cpu and memory usage with all the process id that the grep command has listed but I am facing an error. Any help would be appreciated

#!/bin/bash
PID=`ps -eaf | grep firefox | grep -v grep | awk '{print $2}'`
usage= `ps -p $PID -o %cpu,%mem`

error:

error: process ID list syntax error

Usage:
 ps [options]

 Try 'ps --help <simple|list|output|threads|misc|all>'
  or 'ps --help <s|l|o|t|m|a>'
 for additional help text.

For more details see ps(1).

Solution

To do one at a time

#!/bin/bash
for PID in `ps -eaf | grep firefox | grep -v grep | awk '{print $2}'` ; do
    usage=`ps -p $PID -o %cpu,%mem`
done

Answered By - stark

Answer Checked By - Cary Denson (WPSolving Admin)