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1

3 ways to write bugs with FORTRAN 77

July 17, 2025July 15, 2025
2

Using a Live USB for Linux recovery

July 16, 2025July 14, 2025
3

Getting Started with SELinux

July 15, 2025July 13, 2025
4

A Small Algol 68 Project, Part 2

July 14, 2025July 14, 2025
5

About those livesys error messages

July 11, 2025
6

A Small Algol 68 Project, Part 1

July 10, 2025July 9, 2025
7

Fedora Repo issues during updates

July 8, 2025July 8, 2025
8

The Linux Philosophy for SysAdmins, Tenet 24—Reality Bytes

July 7, 2025July 7, 2025
9

How to fix unresolvable file conflict errors upgrading or installing software RPMs

July 4, 2025July 13, 2025
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Tag: Programming

Programming

3 ways to write bugs with FORTRAN 77

Explore old-style FORTRAN programming with Arithmetic IF, Computed GOTO, and Assigned GOTO.

Jim Hall
July 17, 2025July 15, 2025
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Code Programming

A Small Algol 68 Project, Part 2

In memory of J. Kevin Douglas, a good friend and fellow fan of Algol 68 In the last article in this series, we described a...

Chris Hermansen
July 14, 2025July 14, 2025
Read More
Programming

How I use GNU Indent

Let GNU Indent make your source code easier to read.

Jim Hall
May 12, 2025May 5, 2025
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FreeDOS Fun Programming

Code like it’s the 1980s

Our computers are so powerful today that it’s hard for younger developers to understand what early desktop computing was like. Even more experienced folks can...

Jim Hall
May 7, 2025May 4, 2025
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Programming

Draw in color using Portable Pix Maps

Create colorful images using the Portable Pix Map format.

Jim Hall
April 25, 2025April 19, 2025
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Programming

Grayscale images with Portable Gray Maps

Learn to write grayscale images using the Portable Gray Map format.

Jim Hall
April 23, 2025April 19, 2025
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Programming

Write tiny images using PBM

The Portable Bit Map (“PBM”) image file format was invented in the 1980s as a way to transmit small black and white images as plain...

Jim Hall
April 21, 2025April 19, 2025
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FreeDOS Linux Programming

Reading a whole file at once

Two methods to load a data file into memory. Use mmap on Linux sysetms.

Jim Hall
March 20, 2025March 20, 2025
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FreeDOS Programming

Old-school programming with Turbo C

Explore retroprogramming on FreeDOS with this popular freeware IDE.

Jim Hall
March 19, 2025March 20, 2025
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FreeDOS Fun Programming

Calculate pi by counting pixels

This is a very simple way to measure pi, but it was a fun exercise and I wanted to share it.

Jim Hall
March 14, 2025January 27, 2025
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AI Programming

Using AI to translate code

I was impressed that AI did so well translating from an old language like FORTRAN 77 into a more modern language like C.

Jim Hall
March 7, 2025March 3, 2025
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AI Programming

Cautions when using AI for coding

While AI agents can help streamline development, keep in mind these cautions when using AI for coding.

Jim Hall
March 6, 2025March 3, 2025
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FreeDOS Programming

Draw a Cylon eye in DOS

Have fun by writing a program to simulate a Cylon’s sweeping red eye

Jim Hall
February 5, 2025February 1, 2025
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Programming

Using enumerations in C

Using enumerations with enum makes it easy to store values in a program, yet keep the code easy to read.

Jim Hall
January 17, 2025January 10, 2025
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Programming

Using bit fields and bit masks in C

Using bit fields and bit masks is a common method to combine data without using more complex structures.

Jim Hall
January 10, 2025January 10, 2025
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FreeDOS Programming

Enjoy the holidays with this ASCII fireplace

Enjoy the holidays by writing a ‘fire’ program in ASCII text.

Jim Hall
December 24, 2024December 20, 2024
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Premature optimization is the root of all evil.

— Donald Knuth

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“systemd for SysAdmins” Now Available

May 13,2025

My latest book — a #1 New Release on Amazon — “systemd for Linux  SysAdmins” is now available from my publisher, Apress, and on Amazon.

2nd Edition now Available

All three volumes of this best-selling second edition of my Linux Self-Study course are now available from Apress and Amazon. See the details of this 3-volume self-study course.

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