Red Hat Enterprise Linux Troubleshooting Guide

Understanding the problem statement.
Establishing a hypothesis.
Trial and error.
Getting help.
Documentation.

nderstanding the problem statement.
Establishing a hypothesis.
Trial and error.
Getting help.
Documentation.

scientific method has a specific list of steps that must be followed.

Printing every process in long format

The ps command is a fundamental command for any troubleshooting activity.

What is free, is not always free

The /proc/meminfo file

When executed, the free command will output statistics about the memory available and in use on the system:

free – display memory utilization

By default, df will simply print these values in kilobytes.