macos - Read For Learn

What version of Python is on my Mac?

You could have multiple Python versions on your macOS. You may check that by command, type or which command, like: Or type python in Terminal and hit Tab few times for auto completion, which is equivalent to: By default python/pip commands points to the first binary found in PATH environment variable depending what’s actually installed. So before installing Python packages with Homebrew, the default Python is installed in /usr/bin which is shipped … Read more

Brew install docker does not include docker engine?

Please try running This will install the Docker engine, which will require Docker-Machine (+ VirtualBox) to run on the Mac. If you want to install the newer Docker for Mac, which does not require virtualbox, you can install that through Homebrew’s Cask:

How to change default Python version?

[updated for 2021] (Regardless if you are on Mac, Linux, or Windows:) If you are confused about how to start the latest version of python, on most platforms it is the case that python3 leaves your python2 installation intact (due to the above compatibility reasons); thus you can start python3 with the python3 command. Historically… The naming convention is that generally, most … Read more

OS X: equivalent of Linux’s wget

I’m going to have to say curl http://127.0.0.1:8000 -o outfile

Where to find Application Loader app in Mac?

In more modern versions of Xcode, you’ll find “Application Loader” under the “Xcode” menu (the first menu to the right of the Apple in the menu bar) and it’ll be hiding in the “Open Developer Tools” submenu.

What’s a good hex editor/viewer for the Mac?

What’s a good hex editor/viewer for the Mac? I’ve used xxd for viewing hexdumps, and I think it can be used in reverse to make edits. But what I really want is a real hex editor.

ImportError: No module named sklearn (Python)

Make sure that pip and python are the same version. For example if you run pip for python 2.7, it will install the package only in 2.7, and if your python command point to for example python 3.3 interpreter, it will not have that package

You don’t have write permissions for the /Library/Ruby/Gems/2.3.0 directory. (mac user)

Update: I now have a very detailed step-by-step tutorial for setting up a proper Ruby development environment on a Mac, including a Homebrew troubleshooting section with the most common issues people run into. Although my step-by-step tutorial is guaranteed to work, I also have a script that will save you a lot of time. My tutorial uses a … Read more

Failed to attach the USB device SEGGER J-Link [0100] to the virtual machine WINDOWS 7

I figured it out. You are supposed to: Shutdown the guest Plug in the device, let the host grab it In the host, go to virtual box, and edit the configuration for the guest. In the “Ports” tab, go to USB and add a filter to include the plugged in device Unplug the device Start … Read more

Terminal error: zsh: permission denied: ./startup.sh

Be sure to give it the execution permission. This will give exec permission to user, group and other, so beware of possible security issues. To restrict permission to a single access class, you can use: This will grant exec permission only to user For reference

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