What is GitHub

Git (and Subversion) are version control and project management systems. GitHub is a web-based repository hosting service that is free for public and open-source projects, or you can pay for more advanced features.

There are both GUI and command line tools to manage your projects. There are also a few text editors that integrate some of these version control systems, as well as many development systems, such as Xcode - the latest versions of Xcode integrate both Git and Subversion for use as its source control system, which automates various features.

I do not have enough information to comment. You need to provide more information.

-------------------------------

How to show us a screen image. Avoid personal identification.

on the Mac you do:

command + shift + 3 Will take entire screen. You hear a click.

command + shift + 4 Lets you decide what to take. Mouse pointer changes. Move mouse to upper left corner of desire image. Hold down left mouse key where to start image. Drag mouse to lower left of where you want to stop image. Release mouse.

You will get a file starting with Screen Shot ... .png on the desktop. example:

Screen Shot 2016-09-20 at 2.27.47 PM

click on camera icon.

another window will appear.

click on Browse button

An open file panel appears. Select the file.

After selection a file, I have this screen showing.

You will have to click on Insert Image. You may have to scroll down to see Insert Image button.

Where do you see this? A picture would help. Describe the steps you took to see the message. Start from the time you stared the terminal.

It could be port of some other software you have loaded. Github is used as a repository for open source software.

Perhaps there is something in one of your startup scrips. The most common one can be displayed in the terminal by

cat .bash_profile

here are the others. may be a good idea to cat here if they exist.

~/.bashrc

~/.bash_profile

~/.profile

/etc/profile

/etc/bash.bashrc

post results.

http://stefaanlippens.net/bashrc_and_others/

R

Software developers use source code control systems, and GIT is one. GIT was created by Linus Torvalds (creator of Linux).

GitHub as has been mentioned is a web site that allows people to host their software using GIT to manage the different versions.

GIT does not need to use GitHub. GIT can be setup local or on your own company servers totally isolated from anyone else's GIT servers.

GIT is very good for developers that are distributed across the globe, such as the various Linux projects.