Viewing and Searching Man Pages

As you already probably know, man is the command line program which is used to display Linux manual pages (manpages) which are program reference documents stored locally. At its most basic usage, to view a manpage, simply type man followed by the program you want to view the manpage for. The below … Continue reading

How to Check Disk and Memory Usage

This post is dedicated to checking disk and memory usage with three utilities, df, du, and free. free is arguably the easiest of these three to use, as all it requires is a single line to display the amount of free and used memory in the system. The -m and -t switches used below convert the results to … Continue reading

How to MD5SUM (and SHA256SUM)

In this post I’ll be covering what is and how to MD5SUM and SHA256SUM (which is essentially a more secure version of MD5SUM). Before we get into how to create and verify an MD5SUM, we’ll cover what exactly it is. MD5 is (surprise, surprise!) the successor to MD4, which is a cryptographic hash function that creates a 128 bit … Continue reading

Tar Quick Reference

This post is intended to be a quick reference for the switches to extract and create tar archives. Archive creation: tar cvf filname.tar /files/to/include tar cvzf filename.tar.gz /files/to/include tar cvjf filename.tar.bz2 /files/to/include tar cvJf filename.tar.xz /file/to/include Archive extraction: tar xvf filename.tar tar xvzf filename.tar.gz tar xvjf filename.tar.bz2 tar xvJf filename.tar.xz