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There are so-called startup services in Linux which are set to launch automatically when a Linux system boots up. These startup services, including basic system configurations as well as various add-on services, are needed for a particular Linux system to operate as expected. This tutorial describes how to check what startup services are enabled on boot in Linux.

If you have an aged Linux system, chances are that you have a lot of disk space wasted due to things like application-specific caches (e.g., browser caches), system caches (e.g., apt cache), unnecessary locale files or other temporary files. This tutorial describes how to clean up disk space on Linux by using BleachBit.

Suppose you want to create a zip archive, but with password protection, so that whoever tries to uncompress the zip file must know the right password. On Linux, there are several ways to encrypt and password protect a zip file.

If you are a Linux system administrator, monitoring log files on a server host will be one of your daily routines. The tail command comes in handy as you can monitor a log file in real-time. This tutorial describes how to tail multiple files at once in Linux, by using a command-line tool called multitail.

It is important to measure power consumption in operating system especially when you try to maximize the battery life of your laptop, or reduce the energy bill of rack-mounted servers in a data center. This tutorial describes how to monitor power usage in Linux operating system.

VirtualBox comes with a suite of command line utilities, and you can use the VirtualBox command line interfaces (CLIs) to manage VMs on a headless remote server. This tutorial describes how to create and start a VM without VirtualBox GUI.

If you often deal with JSON-formatted texts in command line or in shell scripts, you may wonder if any command-line utility can parse JSON string. This tutorial describes how to parse JSON string from the command line on Linux.

Have you ever wanted to live stream a video feed from your webcam for someone else? You could use any existing video chat software such as Skype, Google+ Hangouts. However, if you do not want to rely on any third-party streaming infrastructure, you can set up your own webcam streaming server in house. This tutorial describes how to live stream video from webcam by using VLC.

Photo editing software is often used by professional photographers as well as amateur shooters to add various enhancements to pictures taken with a camera. This post covers ten popular photo editing software tools available on Linux.

On Linux, there are several rootkit scanner tools that help project against known or potential rootkits. One such rootkit detection tool is called Rootkit Hunter (rkhunter). This tutorial describes how to scan a Linux system for rootkits by using rkhunter.

To track who changed or accessed files or directories on Linux, you can use the Linux Audit System which provides system call auditing and monitoring. This tutorial describes how to monitor file access on Linux by using auditd.

While it is possible to use GnuPG to encrypt or decrypt files manually, you can use various GUI frontends for GnuPG. One such GUI frontend is GNOME Seahorse, which can manage various types of encryption keys including PGP keys, SSH keys, passphrases, etc. This tutorial describes how to PGP-encrypt, decrypt or digitally sign documents on Nautilus by using Seahorse plugin.

There are various tools that allow you to edit the metadata in digital photos or pdf documents. ExifTool is a powerful command-line utility that can read or write meta information in a file. This tutorial describes how to view or edit metadata in pdf documents or digital pictures from the command line on Linux with ExifTool.

VMware Player and VirtualBox are the two most popular virtualization software packages for x86 processor architecture. This post highlights advantages and disadvantages of VMware Player and VirtualBox in terms of their features.

As a Gmail user, you may want to maintain a separate backup of all email messages in your Gmail account for personal archiving purpose. Email back up is also useful in case you want to change your Gmail address to a different one, or switch to a completely different email provider. This tutorial describes how to back up and restore a Gmail account on Linux with Gmvault.

Password-based authentication is so prevalent online that you probably won’t be able to count how many passwords you are using. In fact, according to NorSIS Password Survey 2012, the average minimum number of private passwords per person is 17. Another research has found that 82% of people have forgotten their password at lease once. This tutorial describes how to manage multiple passwords on Linux with KeePassX.

Linux has Pluggable Authentication Modules (PAM) built-in, offering configurable authorization for Linux applications and services.. This tutorial shows how to configure PAM to monitor failed ssh login attempts on CentOS.

Tor is a free software that enables you to completely hide your online communication via a large-scale anonymity network. Tor can be used for web browsers, VoIP, instant messaging, remote logins, etc. This tutorial describes how to set up Tor so that you can browse the web anonymously inside Google Chrome.

When it comes to text search within a pdf document, pretty much all pdf reader software support it (be it Adobe Reader or any third-party pdf viewer). However, it becomes tricky when there are more than one pdf document to search. This tutorial describes how to search multiple pdf documents for text by using recoll.

Cryptkeeper is a Linux system tray applet that manages encrypted folders. Underneath it, EncFS, which is a FUSE-based encrypted file system, handles transparent encryption/decryption. In this tutorial, I will describe how to password protect a folder on Linux by using Cryptkeeper.