Author Archives: Tommy Butler

apt-get “public key is not available: NO_PUBKEY”

Problem: When you run `apt-get update`, you get an error similar to: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 5C808C2B65558117 The solution: ? ? ? You can fix it with a series of one-off commands that you’ll probably not memorize and always end up googling…  Or, you can… Read More »

The Linux GPG GUI — PGP Key Setup Howto

There’s a multitude of reasons to use the GNU Privacy Guard utility (gpg for short) to protect whatever information you want to keep private.  This tutorial shows you how to set up your PGP key pair in Linux using the GUI.

Autostart VMware Virtual Machines at Boot in Linux

Do you run VMware Workstation on your Linux machine?  I do.  A lot.  So much in fact that I’ve found it necessary to do things with VMware workstation that it doesn’t do on its own.  Maybe in time it will change and add such features, but for now you can’t auto-start VMs on boot.  Well,… Read More »

Compiled and Encrypted suid Perl Programs

The Use Case I recently found myself in need of a way to escalate privileges for only one user on my system (me), for the purpose of running only one script without prompting for a password.  It made sense to run the script setuid and have the code enforce the policy that I alone am… Read More »

Script to Offline and Remove A Disk In Linux

This script will offline and remove a hard drive from your Linux machine.  That doesn’t mean it physically pulls it out of your server 😉  Instead the script spins down the disk, removes it from your server’s list of devices under /dev, and powers it off. This is really handy if your system keeps locking… Read More »

Lacuna Expanse and Team UNSC

Lacuna Expanse is a fun, free MMORPG I got involved in a few months back.  It is written in Perl, which is how I came to know about it in the first place.  It uses XMLRPC, AJAX, JSON, all kinds of cool technologies, and it also exposes an open API to script against.  What’s even… Read More »

Animated Gifs on Linux with ffmpeg and imagemagick

This post is somewhat inspired by the fact that Google+ now makes cool little gif animations from photo bursts of 5 pics or more when you upload.  Very nifty.  But, ugh, the images are SMALL and often choppy.  What if you want larger picture dimensions, smoother or longer animations?  For those who care about making… Read More »

Lunch With Larry Wall

That’s him, the legendary TimToady.  Larry Wall is personally responsible for one of the greatest joys in my life: Larry created Perl. Perl has remained a core staple in my toolbox of awesomeness since 1999, when I discovered it as a younger developer/engineer just starting out my career.  Over the years, Perl has been been a… Read More »