A Technical I.T./DevOps Blog
Problem scenario
You want to remove ink from a whiteboard. You want to clean it, but the eraser does not work. The ink has been on it for a long time. Can Goo Gone work?
Solution
Yes, Goo Gone will work. Acetone would work faster and with less effort. But if you have extra Goo Gone,
…
Continue reading “Can Goo Gone Remove Ink from a Whiteboard?”
Problem scenario
You want to remove MIR coins from a custodial exchange to put on your Trezor device. What should you do?
Solution
Deposit it to the Trezor device’s Ethereum address. You may not need any other wallet or software. It may support the MIR natively if you can send it to an Ethereum address! Kraken’s MIR will allow you to put the coins on Trezor without the assistance of MetaMask or some other wallet.
…
Continue reading “How Do You Get Mirror Protocol (MIR) to Be on Your Trezor Device?”
Question
What was the relevance St. Andrew’s Lodge had to patriotic activity in the 1760s and 1770s in Boston?
Answer
…
Continue reading “What Was the Significance of St. Andrew’s Lodge in the American Revolution?”
Problem scenario
You want to know the syntax of the runsc utility. How do you run “runsc kill” or other commands?
Prerequisite
This assumes you have runsc installed. On a Debian distribution of Linux, run this command:
sudo apt -y install runsc
Solution
Run “runsc ?” to learn more about different syntax.
…
Continue reading “How Do You Run runsc kill or Other runsc Commands?”
Question
You have read about primitives in distributed applications. How is a semaphore different from a mutex?
Solution
A semaphore allows different threads to write to a file whereas a mutex does not allow more than one thread to write to the file.
…
Continue reading “How is a Semaphore Different from a Mutex?”
Problem scenario
You want to see the flags and options of the ulimit Linux command. You try “man ulimit” and find very little information. What should you do?
Solution
Run this command:
ulimit -a
You will see a dash followed by a letter in rows alphabetically sorted according to the flag/option.
“ulimit -n” will show you the number of open files.
…
Continue reading “What Can You Do to See the Flags and Options of the ulimit Linux Command?”
Problem scenario
You want to see what hexadecimal, public Ethereum address an ENS name resolves to. You have the name. What do you do?
Solution
…
Continue reading “How Can You Find the Address Based on an ENS Name?”
Problem scenario
You want to test PyTorch. What should you do?
Answer
1. Enter a virtaulenv. Use How Do You Install and Create a Virtual Environment? if necessary.
2. Run this: pip3 install torch
3. Use this program:
# This was produced by a Google search in an AI overview result on Aug 4 2025.
…
Problem scenario
You are trying to send ENJ to a different wallet/address. You see “Address isn’t valid.” What should you do?
Possible Solution #1
Double check you have the right address to receive ENJ.
Possible Solution #2
Initially ENJ used an Ethereum block chain. It now uses its own Enjin Relaychain. You may have to transfer a stablecoin or other coin to a platform or wallet and do a swap there.
…
Continue reading “How Do You Send and Receive ENJ with the Error “Address isn’t valid”?”
Problem scenario
You run this: sudo apt -y update
You get this output that includes an error message:
Hit:1 http://us.archive.ubuntu.com/ubuntu focal InRelease
Hit:2 https://d3nt0h4h6pmmc4.cloudfront.net/ubuntu bionic InRelease
Hit:3 http://us.archive.ubuntu.com/ubuntu focal-updates InRelease
Get:4 https://dl.google.com/linux/chrome/deb stable InRelease [1,825 B]
Hit:5 http://us.archive.ubuntu.com/ubuntu focal-backports InRelease
Hit:6 http://security.ubuntu.com/ubuntu focal-security InRelease
Err:4 https://dl.google.com/linux/chrome/deb stable InRelease
The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY
Reading package lists… Done
Building dependency tree
Reading state information… Done
All packages are up to date. …