Go Systems Programming

An even better file copy program

This section will present a program that uses a more traditional approach, where a buffer is used for reading and copying to the new file.

Although traditional Unix command-line utilities are silent when there are no errors, it is not bad to print some kind of information, such as the number of bytes read, in your own tools. However, the right thing to do is to follow the Unix way.

There exist two main reasons that make cp.go better than notGoodCP.go. The first is that the developer has more control over the process in exchange for having to write more Go code and the second is that cp.go allows you to define the size of the buffer, which is the most important parameter in the copy operation.

The code of ...