Tr is a command used in Linux and Unix systems that translates, converts and deletes characters from standard input and writes to stdout.
Source: Tr Command in Linux with Examples (LinOxide)
3 Ways to Force Unmount Directory in Linux Showing “device is busy”
On linux when you try unmount say NFS service you might see umount device is busy message. Lets see how to fix this issue by force unmount in a graceful way.
Source: 3 Ways to Force Unmount Directory in Linux Showing “device is busy” (LinOxide)
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ZRAM Boosts Raspberry Pi Performance
Linux is a two-edged sword. On the one hand, there’s so much you can configure. On the other hand, there’s so much you can configure. It is sometimes hard to know just what you should do to get the best performance, especially on a small platform like the Raspberry Pi. [Hayden James] has a suggestion: enable ZRAM and tweak the kernel to match.
Source: ZRAM Boosts Raspberry Pi Performance | Hackaday
Also see: Raspberry Pi Performance: Add ZRAM and these Kernel Parameters (hayden-james@linux:~$ _)
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iRaspbian Makes Your Raspberry Pi Work Like a Mac
Note: If you can’t find this anymore try reading the comments under the YouTube video.
This new Raspbian skin looks just like Apple Mac OS X.
Source: iRaspbian Makes Your Raspberry Pi Work Like a 2001 Mac | Tom’s Hardware
EDIT: Apparently this is now called Twister OS:
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Adding Ethernet to a Raspberry Pi Zero
If you have ever wanted to use a Raspberry Pi Zero with a wired Ethernet port, the article linked below shows an easy and inexpensive way to do it. Sure, you can always use one of those Ethernet to USB dongles but those cost more, and where’s the fun in that?
Adding an Ethernet port to a Raspberry Pi Zero is quick and easy using a cheap ENC28J60 ethernet module. Start your Pi Zero Ethernet upgrade project now.
Source: Adding Ethernet to a Pi Zero – Raspberry Pi Spy
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Apache 101: 0-WordPress in 15 minutes
Apache gets an undeserved bad rep from outdated guides—learn to set it up right.
Source: Apache 101: 0-WordPress in 15 minutes | Ars Technica
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My Favourite Secret Weapon – strace
Why strace?
I’m often asked in my technical troubleshooting job to solve problems that development teams can’t solve. Usually these do not involve knowledge of API calls or syntax, rather some kind of insight into what the right tool to use is, and why and how to use it. Probably because they’re not taught in college, developers are often unaware that these tools exist, which is a shame, as playing with them can give a much deeper understanding of what’s going on and ultimately lead to better code.
My favourite secret weapon in this path to understanding is strace.
Source: My Favourite Secret Weapon – strace – zwischenzugs
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Strings in Python
Learn how strings are handled in the Python programming language with this guide.
Source: Strings in Python – Pi My Life Up
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Connect up to 32 Relays to Raspberry Pi with a Stackable 4-Relay Board (Crowdfunding)
Two years ago, Sequent Microsystems introduced a stackable 8-Relay board enabling up to 64 relays to be connected to a single Raspberry Pi board. The 8-relay board only supported 24V/2.5A, and the company is now back on Kickstarter with a 4-relay board with 250V/10A line-switching relays that can offer up to 32 relays by stacking 8 boards connected to one Raspberry Pi board via the 40-pin I/O header.
Source: Connect up to 32 Relays to Raspberry Pi with a Stackable 4-Relay Board (Crowdfunding) (CNX Software – Embedded Systems News)
Also: Stackable Raspberry Pi add-on has four switched relays (LinuxGizmos)
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How To Fix Broken Ubuntu OS Without Reinstalling It
This brief tutorial describes how to easily fix broken Ubuntu OS without losing data or without reinstalling it completely.
Source: How To Fix Broken Ubuntu OS Without Reinstalling It – OSTechNix
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