Go packaging system

How to create and use packages in golang.

1. export GOPATH='~/Desktop/go/project'  #set the GOPATH to the pwd
2. mkdir -p $GOPATH/{bin,pkg,src}        #create the required subdirectory sturcture: {bin,pkg,src} 
3. tree $GOPATH
/Users/Tim/Desktop/go/project
├── bin
├── pkg
└── src

4. mkdir $GOPATH/src/my_new_package											#create a package folder with the same name as the package itself
5. touch $GOPATH/src/my_new_package/my_new_package.go

6. subl $GOPATH/src/my_new_package/my_new_package.go
#add content

7. cd $GOPATH/src/my_new_package
8. tree .

/Users/Tim/Desktop/go/project
├── bin
├── pkg
└── src
    └── file
        └── file.go

9. go install																						#go install creates new linkable files and stores them in the pkg folder by archetecture
10. tree .

/Users/Tim/Desktop/go/project
├── bin
├── pkg
│   └── darwin_amd64
│       └── file.a
└── src
    └── file
        └── file.go

11. now no matter where the main go file lives on the system you can 

import "file"

because the $GOPATH allows file to be found.