good good study, day day up!

vendor/gopl.io/README.md

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+# The Go Programming Language
+
+This repository provides the downloadable example programs
+for the book, "The Go Programming Language"; see http://www.gopl.io.
+
+These example programs are licensed under a <a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/">Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License</a>.<br/>
+<a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png"/></a>
+
+You can download, build, and run the programs with the following commands:
+
+	$ export GOPATH=$HOME/gobook            # choose workspace directory
+	$ go get gopl.io/ch1/helloworld         # fetch, build, install
+	$ $GOPATH/bin/helloworld                # run
+	Hello, 世界
+
+Many of the programs contain comments of the form `//!+` and `//!-`.
+These comments bracket the parts of the programs that are excerpted in the
+book; you can safely ignore them.  In a few cases, programs
+have been reformatted in an unnatural way so that they can be presented
+in stages in the book.
+