To do this, you simply need to log into the downloads section of the Apple developer site using an Apple ID.

The next option is to download the latest command line tools from Apple's developer page. The command line tools are available as standalone installer packages from the Apple Developer Web site. However, installing this will also include XCode itself, and despite its benefits, some people may not wish to have the entire Xcode suite installed on a system. The first is to install Apple's XCode developer suite, which is available via the Mac App Store for free. If you need these tools for some reason, then there are three ways you can get them on your Mac.

While OS X ships with a number of common commands, by default Apple does not include those that are used for checking out, compiling, and otherwise managing code for developing applications. Part of OS X is its powerful command-line interface, where a competent or even novice programmer can make use of a number of tools for configuring and customizing the system, and make programs and scripts.

Download xcode command line tools