Linux / Unix
Security, Administration, Virtualization and More

Getting Started

Linux/UNIX Command Fundamentals and the File System

Customize Your Command-Line Environment: My .bashrc file

Using ssh and scp

Unix Text Processing — Free download of a classic textbook covering basic intro through document production with nroff, troff, etc.
Chapter 2: UNIX shell fundamentals, Chapter 3: Learning vi, Chapter 7: Advanced editing, Chapters 11, 12: More fundamental commands, Chapter 13: awk

Linux Installation, Booting, and System Design

Linux Performance Tuning: Storage and Networking

How Linux Boots, Run Levels, and Service Control — init, Upstart, and systemd

Upgrading: Red Hat Enterprise Linux / CentOS 6–7–8–9

How to Migrate a System from Red Hat Enterprise Linux to CentOS

Support the AMD Ryzen GPU on Mint and Ubuntu Linux

GRUB and VGA Modes

UEFI and Secure Boot

Reconfigure the Keyboard and Mouse

Rescuing a Linux System with an LVM Root File System

User and System Administration Commands

Linux System Administration — The Core Set of Commands

Package Management on Linux, BSD, and Other UNIX-Family OSes — A Phrase Book for rpm/yum/urpmi, apt-get/dpkg, pkg, pkg_*, and pkg*

How to Build Binary Packages from Source

How to Display the Word Count in the vi/vim Status Line

How to Back Up, Mirror, and Transfer Data with rsync

Data transfer with tar and SSH

How to Create an RPM Package of a Directory Structure

How to Create and Use Patch Files for RPM Packages

Vi editor manuals and tutorials

Linux and BSD repository statistics

IBM Technical Library "Anatomy of..." articles on Linux: loadable kernel modules, file systems, flash devices, SELinux, real-time Linux architectures, SCSI, networking stack, etc.

The Linux Kernel

Exploring Linux sysfs and the PCI Buses

How to Build Linux Kernels

Exploring the Linux Kernel

Networking

TCP/IP Configuration Commands for Linux, UNIX, Android, Apple OS X, Windows, and Cisco IOS

Running IPv6 on Linux with a Motorola/Arris Surfboard cable modem connected to Comcast

How to set up and use SSH

Kerberos, LDAP, Samba, and Active Directory

How to build an Active Directory server from Samba running on FreeBSD on a Raspberry Pi

Linux and Security

Running TLS 1.3 with Nginx and OpenSSL

How to Use Let's Encrypt ECC and RSA TLS Certificates on Google Cloud

How to Use Let's Encrypt TLS Certificates on GoDaddy Shared Hosting

How to Assess and Harden Linux with OpenSCAP

How to harden the TCP/IP protocol stack by tuning the kernel

How to break into Linux (and how to prevent this)

YubiKey Authentication

YubiKey Authentication With pam_pkcs11.so

YubiKey Authentication With pam_yubico.so

YubiKey Authentication With pam_u2f.so

Linux PAM Configuration for Compliance

US DoD / DISA STIG Compliance For Linux

My general computer / network security page

How to harden a Linux or BSD installation

Analyzing a Simple Intrusion

Analyzing Multiple Intrusions into a Poorly Configured Linux System

File System Design for Performance and Security

How to set up and use SSH

Secure Distributed Logging with Rsyslog and TLS

How to set up encrypted storage on Amazon EC2

How to make sendmail use SSL/TLS whenever possible

Linux and Security Blog — Thoughts from Time to Time on Linux, Security and the Cloud

How to build an Active Directory server from Samba running on FreeBSD on a Raspberry Pi

FreeBSD and OpenBSD

Running OpenBSD on low-end Dell laptops: installation and some KDE/KDM tricks

WPA2 / 802.11i Wi-Fi/WLAN Wireless Networking on OpenBSD

How to Build OpenBSD Kernels and Upgrade

How to Build Wireshark on OpenBSD

How to Build OpenCV on OpenBSD

How to Build OpenVAS on OpenBSD

How to Build Rainbow Crack on OpenBSD

Web and Electronic Mail — Firefox, Chrome, Thunderbird, Nginx, and Apache

How to migrate your e-mail from KDE KMail to Mozilla Thunderbird

How to Change Thunderbird's Default Browser: Firefox vs Chrome

How to Automate Posting to Mastodon and Twitter with Python

Using BitTorrent Magnet Links with Firefox and Chrome

How to analyze Nginx and Apache logs with basic UNIX commands

How to visualize Nginx and Apache logs with color

Devices and Multimedia

Building a Media Player with Kodi, Linux, and the Raspberry Pi

Adding Multiple Speaker Sets to Linux

Using Multi-Terabyte External Disks with Linux

/dev/random on Linux and other UNIX family operating systems — How does it work, how random is it, what about adding a hardware random number generator?

Digital Cameras, Linux, and BSD

Linux on Blu-ray Players

Fix for: My Microphone Is Not Working

How to Add MP3/MPEG Support to Red Hat, Oracle, CentOS, Fedora, and Scientific Linux

How to download YouTube videos and convert them to XviD and DivX

Using an HP ENVY Multifunction Printer / Scanner with Linux

Using a Canon PIXMA Multifunction Printer / Scanner with Linux

Change the printer "Ready" message to whatever you want

Fixing the Problems Causing Warning and Error Messages

Solve the Xsane problem:
Failed to open device, invalid argument

PDF and Postscript Failures with ImageMagick


				convert-im6.q16: not authorized `foo.pdf' @ error/constitute.c/WriteImage/1037

Warning Messages About Font Aliases


				Having multiple <family> in <alias>
				isn't supported and may not work as expected

Error Messages About Missing GTK Modules

Failed to load module "libcanberra-gtk-module.so":
				libcanberra-gtk-module.so: cannot open shared
				object file: No such file or directory

Raspberry Pi

Which model and how much memory?

$ cat /sys/firmware/devicetree/base/model
$ grep MemTotal /proc/meminfo

Hardware and Background
Linux and Other Operating Systems on a Low-cost 86×54 mm Board

Networking: Wired and Wireless
IPv4 and IPv6, Static and DHCP, WPA-2 Security

How to Build an OpenVAS Vulnerability Scanner with a Raspberry Pi

How to Build a Network-Attached Storage Server with a Raspberry Pi

How to Build an Active Directory Server on a Raspberry Pi Running FreeBSD with Samba

Cut the Cable: How to Replace Cable TV with Kodi Running on a Raspberry Pi

Getting Started with a Raspberry Pi and an RTL-SDR Receiver

ADS-B Flight Tracking with a Raspberry Pi and Software-Defined Radio

Running both fr24feed on Linux/x86_64 and piaware on Linux/ARM

1090 MHz ADS-B Antenna

Amazon
ASIN: B07XTRFD3Z

Virtualization

Commands for Linux Virtualization: chroot, LXC, Docker, QEMU/KVM, virsh, and XML definitions of virtual machines

VMware Networking

How to Build VirtualBox on Linux

How to install the QEMU emulator and Linux on a USB device, so you can run Linux within a window on a hosting machine running Linux or BSD or Windows

How to install and run Windows within the QEMU emulator on an OpenBSD or Linux desktop

CyanogenMod on Samsung Galaxy Smart Phones

How to install CyanogenMod on the Samsung Galaxy

How to solve the "Insufficient Storage Available" problem on Android and CyanogenMod

How to take a screenshot on the Samsung Galaxy

How to set custom ringtones, alarms and notification sounds on a Samsung Galaxy

SIM unlocking the Samsung Galaxy

Installing a local SIM

How to connect the Samsung Galaxy to Linux or OpenBSD

How to run an SSH server on CyanogenMod

How to block calls from telemarketers

How to access the secret test menu

Other Varied Linux/Unix Topics

Linux/Unix tips and tricks

EIDE / PATA / SATA / USB / Floppy cable pinouts

Learning Tree course 144 supplemental material

Learning Tree course 1901 supplemental material

USENIX, The Advanced Computing Systems Association, has made all their conference proceedings available to everyone

Frog Tips

An especially useless Windows error message

Windows, if we must

How to Multiboot OpenBSD and Windows

Recover the Windows License Key with WMIC

Fixing the PATH on Windows so you can easily run useful software that you had to add

Installing Office 2007 on Windows XP — Dealing with: "The specified program requires a newer version of Windows"

Classics

Chrome Support on Old Non-SSE2 CPUs

CentOS Linux on an Alpha

How to Build Linux kernels on Alphas

BIOS / POST Beep Error Codes

Command-Line FTP

Oddities

The Gallery of Epic Fail and Crash Dump Screens

How to Use a Mod 26 Keypunch

UNIX the Supermodel

UNIX the Fire Extinguisher

Linux the Laundry Detergent

The Gospel of Tux

Biblical Unix

What might be Windows Vista source code

How does one patch KDE2 under FreeBSD?

Как пропатчить KDE2 под FreeBSD?

The Doom that Came to Puppet — Posts generated by a Markov chain trained on the Puppet documentation and the assorted works of H. P. Lovecraft.
"Puppet is an open-source next-generation server automation tool. It is composed of a viscous jelly."
"Place this schema into your schema directory, on Debian for example this would be the mighty beetle civilisation."
"I was awake and dreaming at the same time, which is why this only works for local variables."
"Puppet's Resource Abstraction Layer (RAL) allows you to retrieve much of the archaic life and lore of the primal planet."
"The official Puppet Labs packages will install it as a monstrous cylindrical tower."
"This document is currently being used in production at several large sites, but there are some experiences and intimations which scar too deeply to permit of healing, and leave only such an added sensitiveness that memory reinspires all the original horror."

Now some lurid advertisements from Google AdSense:

Home

Travel

Linux/Unix

Cybersecurity

Networking

Technical

Radio

Blog

🦣 Bob the Traveler 🦣 Conan the Sysadmin

Viewport size: ×
Protocols: HTTP/1.1 / TLSv1.3
Crypto: X25519 / TLS_AES_256_GCM_SHA384

© by Bob Cromwell Dec 2023. Created with vim and ImageMagick, hosted on FreeBSD with Nginx.
As an Amazon Associate, I earn from qualifying purchases.
Contact | Privacy policy | Root password