A Technical I.T./DevOps Blog
Problem scenario
You run a Python program with datetime, but you get the error “TypeError: ‘module’ object is not callable.” What should you do?
Solution
Even though you may use “import datetime” at the top of the program, you should use “from datetime import datetime, timezone” at the top. If you used the syntax “datetime.datetime…”, you will need to remove one of the “datetime.” strings from the code.
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Question
What do the terms upstream and downstream mean in I.T.?
Answer
If a project B is downstream from project A, project B has evolved from project A. In the genealogy of software/code/projects, project A is said to be upstream to project B if project A is an ancestor of project B. Project D is said to be downstream to project C if project D is a descendant of project B.
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Continue reading “What Do the Terms Upstream and Downstream Mean in I.T.?”
Problem scenario
You installed wine. You ran a command, but you got this:
“wine: could not exec wineserver”
What should you do?
Solution
1. Run this:
sudo find / -name wineserver64
2. Run this command but replace “/path/to” with the path to the wineserver64 file you found above:
export wineserver=/path/to/wineserver64 …
Continue reading “How Do You Troubleshoot “wine: could not exec wineserver”?”
Problem scenario
You are using Eclipse for the first time. You try to to use Run, but you get an error message like this: “Unable to Launch The selection cannot be launched, and there are no recent launches.” Or you try to go to “Run configuration” and you have a prototype, but the “Run” button is grayed out. What should you do?
Solution
In the Run configuration section,
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Question
What patriotic songs were written during the American Revolution?
Answer
“The Toast” by Francis Hopkinson
“World Turned Upside Down” (instrumental)
“The Liberty Song” by John Dickinson
“Free America” by Joseph Warren
“Chester” by William Billings; see also: https://en.wikipedia.org/wiki/William_Billings
“Yankee Doodle“
“My Days Have Been So Wondrous” by Francis Hopkinson.
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Continue reading “What Are Some Songs During the American Revolution?”
Problem scenario
You are using Linux, and you want to know what JQuery version is installed. What do you do?
Solution
JQuery is a library to work with Javascript. There are many ways to install JQuery: git, using a .tar.gz file, the YARN CLI, or the npm command.
If it was installed with npm, one way find out the version is to run one of these command:
npm view jquery versions
npm view jquery version
npm view jquery
npm info jquery
npm ls jquery
This solution was partially taken from this external page.
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Continue reading “How Do You Find the JQuery Version from the Command Prompt of a Linux Server?”
Problem scenario
You run a command, but you get a message like “filenotfounderror”, “file or directory does not exist” or something similar. What should you do?
Possible Solution #1 (assuming that the file exists)
Do either i. or ii.
i.a. Find the original file with a command like this: sudo find / -name foobar
i.b. Create a symbolic link or a hard link to the file.
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Continue reading “How Do You Troubleshoot a “File Not Found” Message?”
Question
You are not sure if muscles really flex. You are curious if joints flex at all. Do either human muscles or human joints flex?
Answer
Muscles do not flex, but joints do flex. Muscles contract. Joints can “flex and extend.” Source: Page 100 of Starting Strength. Another source is https://www.pumpone.com/blog/39.
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Problem scenario
You open a terminal window in Linux. You get an error like one of the following:
flatpak: /lib64/libldap_r-2.4.so.2: no version information available (required by /lib64/libcurl.so.4)
flatpak: error while loading shared libraries: libsasl2.so.2: cannot open shared object file: No such file or directory
What should you do?
Solution
(This solution will work if the file is in a different location from where it was expected on your server.)
1.
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Problem scenario
Your NIC on your Fedora Linux server totally will not work. The physical NIC has no lights on it. It seems it is disabled. You cannot enable it with commands.
You see errors like these in logs: “NetworkManager.service: Start request repeated too quickly.”
What should you do?
Solution
Run this command:
journalctl -u NetworkManager
Do you see lines like these?
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Continue reading “How Do You Get a NIC on a Linux Server to Work?”