- A Cloud Guru
Working with Files in CentOS
Knowing the different commands to look at and manipulate files is a required skill for new system administrators. This hands-on lab will allow you to use the different utilities for normal sysadmin work and learn through repetition. **Note:** After the lab starts up, please wait a minute or so to give the instance time to spin up before connecting via SSH.
Table of Contents
Find Out How Many and What Type of CPUs Are on the System
Note: After the lab starts up, please wait a minute or so to give the instance time to spin up before connecting via SSH.
Once you ssh in, become
We need to look at the CPUs on the system. That information is stored in
catthat file, we notice we only have one CPU so we can just use
head -5to get the relevant information.
To do this, run:
head -5 /proc/cpuinfo > /tmp/cpus
If we had more than one CPU, we could use
grep -A 4 processor /proc/cpuinfoto get information about all of them. The
-Aflag tells grep to print four lines after it matches, and we're looking for "processor", which is the first line of the
Gather the Logs
Get the format for today's date:
Copy and paste the date.
Run the following, and output it to the terminal to make sure it looks right:
grep "<DATE> " /var/log/messages
Once we verify it looks right, run:
grep "<DATE> " /var/log/messages > /tmp/logs
Find Out How Many Users Are on the System
/etc/passwdcontains all the users on the system, we just need to count how many lines are in that file. Fortunately, the
wccommand will do that for us.
wc -l /etc/passwd > /tmp/usernum
What's a lab?
Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.