Explanation of installation and configuration of building go environment under linux

taogeqq@taogeqq-virtual-machine:~/myspace$ ls
a.out go1.2.1.linux-386.tar.gz test.cpp test.go
taogeqq@taogeqq-virtual-machine:~/myspace$

 root@taogeqq-virtual-machine:/home/taogeqq/myspace# tar zxvf go1.2.1.linux-386.tar.gz -C /usr/local/

root@taogeqq-virtual-machine:/home/taogeqq/myspace# ls /usr/local
bin etc games go include lib man sbin share src
root@taogeqq-virtual-machine:/home/taogeqq/myspace#

taogeqq@taogeqq-virtual-machine:~/myspace$ ls
a.out go1.2.1.linux-386.tar.gz test.cpp test.go
taogeqq@taogeqq-virtual-machine:~/myspace$ 
taogeqq@taogeqq-virtual-machine:~/myspace$ cat test.go
package main
import "fmt"
func main(){
  fmt.Println("hello world")
  fmt.Println("This is my first Go code")
}
taogeqq@taogeqq-virtual-machine:~/myspace$ 
taogeqq@taogeqq-virtual-machine:~/myspace$ /usr/local/go/bin/go run test.go
hello world
This is my first Go code
taogeqq@taogeqq-virtual-machine:~/myspace$

taogeqq@taogeqq-virtual-machine:~/myspace$ go run test.go
The program 'go' is not installed. You can install it using the following command:
sudo apt-get install golang-go
taogeqq@taogeqq-virtual-machine:~/myspace$

taogeqq@taogeqq-virtual-machine:~/myspace$ echo $PATH           
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
taogeqq@taogeqq-virtual-machine:~/myspace$ 
taogeqq@taogeqq-virtual-machine:~/myspace$ vim /home/taogeqq/.bash_profile
taogeqq@taogeqq-virtual-machine:~/myspace$ 
taogeqq@taogeqq-virtual-machine:~/myspace$ cat /home/taogeqq/.bash_profile
export PATH=$PATH:/usr/local/go/bin/
taogeqq@taogeqq-virtual-machine:~/myspace$ 
taogeqq@taogeqq-virtual-machine:~/myspace$ source /home/taogeqq/.bash_profile
taogeqq@taogeqq-virtual-machine:~/myspace$ 
taogeqq@taogeqq-virtual-machine:~/myspace$ echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/go/bin/
taogeqq@taogeqq-virtual-machine:~/myspace$ 
taogeqq@taogeqq-virtual-machine:~/myspace$ go run test.go
hello world
This is my first Go code
taogeqq@taogeqq-virtual-machine:~/myspace$