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Linux Administration Guide

Last updated: December 28, 2022

Written by: baeldung

Administration
Series

General

Find Out the Total Physical Memory (RAM) on Linux
Tracking Down Where Disk Space Has Gone on Linux
Shut Down and Reboot Linux Systems From the Terminal
Free Command in Linux
The strace Command in Linux
Get Overall CPU Usage on Linux
How to Monitor Disk IO in a Linux System

Shell

Using the find -exec Command Option
Difference Between .bashrc, .bash-profile, and .profile
What's the Difference Between sh and Bash?
Combine and Execute Multiple Linux Commands
How to Delete the History of the Last n Commands?
Changing the Default Shell in Linux
Locale Environment Variables in Linux

Users

Running Script or Command as Another User in Linux
How to Change the Default Home Directory of a User
List All Groups in Linux
Fixing the "Command Not Found" Error When Using Sudo

Files & Directories

What does /opt mean in Linux?
Mounting Remote Directory in Linux Using SSHFS
"No such file or directory" Error When Executing a Binary
What are .a and .so Files?
How to Remove Symbolic Links
Rotating Logs With Logrotate in Linux
Fixing the "Too many open files" Error in Linux

Networking

Mapping Hostnames with Ports in /etc/hosts
SSH Tunneling and Proxying
Monitoring Network Usage in Linux

Processes

Kill All Members of a Process Group
How to Find Which Process Was Killed by Linux OOM Killer
The Most Common Flags in /proc/cpuinfo with Examples
Linux Process States

Security

Copying SSH Keys To Another Machine
Encrypting and Decrypting Directory in Linux
Why Do We Use su - and Not Just su?
Sudo Command in Linux
Why Should We Disable Root-Login Over SSH?
Shell Script for Logging Into a SSH Server

Services

Run a Script on Startup in Linux
Run a Java Application as a Service on Linux
How to Load Environment Variables in a Cron Job
How to Check Logs Using journalctl
How to Run a Script at a Certain Time on Linux
Configure a Systemd Service to Restart Periodically

Docker

Starting a Shell in the Alpine Docker Container
How to Use Multiple Databases with docker-compose

Utilities

Configuring and Managing Core Dumps in Linux
Guide to the Linux screen Command
Linux last Command
Solving the "bad ELF interpreter" Error
Command Line Clipboard Access and Alternatives

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