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Go: A Beautiful Mess

originally published on I published it here because medium is blocked in some countries. An old school guy like me love statically typed language, even I tasted the convenience of dynamic typed languages for handling data with complex structure like JSON or operating data with SQL/NoSQL. The statically typed language avoids many ambiguous issues and let us figure out the mistake before before unit test reports it. So I love Go in many pieces, it leverages many concepts from other languages, has a easy understanding struct types, great tool set for production…etc, and most importantly, it’s easy to write and performance will not let you down, but I also got confused sometimes and found many ambiguous parts in Go.

What is the difference between \r, \n, \t, and \f in C programming?

These aren’t unique to “C programming”. These are various “control characters”, originally used to control the write-head and paper feeder on Teletype machines. \n is “line feed”. This would bump up the paper one line, whatever that was, but not move the write head. If you did abc\ndef, the teletype would print abc def \r is “carriage return”. This would cause the write head to return to its leftmost position.

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Free space in your Mac for Mobile Development

If you are developing mobile apps for Android and/or iPhone and iPad, make sure to delete unused old software you installed in your journey to develop apps through months of updates and installations of libraries and tools. If you do not want to clean your xcode on Mac manually, there are DevCleaner for Xcode which helps your delete obsolete/unwanted software tools/libs/cache/log. Android Studio clean up Gradle Your Gradle Home directory contains wrapper, caches and daemons files.

How to use dd to create a bootable USB stick ?

Using dd needs a geek or a developer! if you want to use graphical tools instead, use rufus, popsicle or ventoy. If you sure you want to use dd, here is the step by step guide. First, identify your USB stick (a.k.a USB drive) on your system using this command sudo fdisk –l. The USB stick in my case is /dev/sdb as you can see in the picture. So let’s unmount it via this command umount /dev/sdb*.

Popsicle - Linux utility for flashing multiple USB devices in parallel

Popsicle is a tool made by Pop! OS team. It is a simple tool to create bootable USB drive/stick. It is pre-installed on Pop! OS Linux distribution. Popsicle details in brief Features Value Open source Yes, on Github Free (of charge) Yes Programming language Rust can create a bootable Linux disro Yes can create a bootable Windows No Multilanguage (spoken languages) Yes English (the universal language) Yes uptodate yes, updated 3 days ago How to use Popsicle to create bootable USB sticks ?

Mac OS X Terminal: How to use option+delete to delete a word ?

I can backward delete a word using OPTION+DELETE on any text editor on Mac OS but I can’t use it to delete the last word I wrote on Terminal!! It is simple, just with a click of a box! Open Terminal, click on Terminal in menu bar, choose Preferences…, go to profiles tab, click on keyboard tab, check Use Option as Meta key. That’s it! we’re done. You can see the steps on this screenshot.

How to Stream Your Pre-Recorded Videos to Facebook Live ?

Since Spring 2016, Facebook users have had the option to broadcast live videos to their friends and followers. Live videos are expected to be more personal, candid, and off-the-cuff, so they’re a great option for when you want to add some personality to your Facebook page. Not to mention, they’re pretty darn effective. Live videos tend to receive 10x better engagement than pre-recorded video. They make watching a stream into an event.

Fsck Exfat (fsck_exfat) Manual Page Apple Docs

I looked at Apple manual page online, and didn’t find the page. So I decided to add it here for reference when needed. FSCK_EXFAT(8) BSD System Manager's Manual FSCK_EXFAT(8) NAME fsck_exfat -- Verify and repair ExFAT file systems. SYNOPSIS fsck_exfat -q device ... fsck_exfat [-f] [-p] [-y | -n] [-g | -x] [-d] device ... DESCRIPTION The fsck_exfat utility verifies and repairs ExFAT file systems. The first form of fsck_exfat quickly checks the specified file systems to determine whether they were cleanly unmounted.

[Solved] Disk Utility Stuck on Wait Partition Activate

Fix corrupted exFAT disk macOS/OSX exFAT support on macOS seems to have some bugs because my external drives with exFAT formatting will randomly get corrupted. Disk Utility is unable to repair this at first, but the fix is this: Use diskutil list to find the right drive id. You want the id under the IDENTIFIER column, it should look like disk1s1 Run sudo fsck_exfat -d <id from above>. eg sudo fsck_exfat -d disk1s3 -d is debug so you’ll see all your files output as they’re processed.