February 2018
Intermediate to advanced
340 pages
9h 43m
English
Content preview from Go Standard Library Cookbook
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Creating a program interface with the flag package
The previous recipe describes how to access the program arguments by a very generic approach.
This recipe will provide a way of defining an interface via the program flags. This approach dominates systems based on GNU/Linux, BSD, and macOS. The example of the program call could be ls -l which will, on *NIX systems, list the files in a current directory.
The Go package for flag handling does not support flag combining like ls -ll, where there are multiple flags after a single dash. Each flag must be separate. The Go flag package also does not differentiate between long options and short ones. Finally, -flag and --flag are equivalent.
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