golang personnal experimentation and test

from go to the web and go to the Operating System

Code explanation

    * read and print the output gocat2.go
     - go run gocat2.go ~/bob
     - able to read and print the output of a file using directly ~/
     - log the error from the execution of the code
    * read and print the input of the terminal gocat.go
     - go run gocat.go
     - tell to the output what you want /home/user/file
     - print the output
     - log the errors from the execution of the code