Install the Go tools
If you are upgrading from an older version of Go you must first remove the existing version.
Linux, Mac OS X, and FreeBSD tarballs
Download the archive and extract it into /usr/local, creating a Go tree in /usr/local/go. For example:
tar -C /usr/local -xzf go1.8.3.linux-amd64.tar.gz
(Typically these commands must be run as root or through sudo.)
Add /usr/local/go/bin to the PATH environment variable. You can do this by adding this line to your /etc/profile(for a system-wide installation) or $HOME/.profile:
export PATH=$PATH:/usr/local/go/bin
Installing to a custom location
The Go binary distributions assume they will be installed in /usr/local/go (or c:\Go under Windows), but it is possible to install the Go tools to a different location. In this case you must set the GOROOT environment variable to point to the directory in which it was installed.
For example, if you installed Go to your home directory you should add commands like the following to $HOME/.profile:
export GOROOT=$HOME/go1.X export PATH=$PATH:$GOROOT/bin
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