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Makefile add subcommand example
README add subcommand example
config_sample.conf add subcommand example
config_sample_2.conf add subcommand example
example.go ...

README

# Try the following commands:

./getopt-sample-app                  # returns an error that required option is missing

./getopt-sample-app -i4              # works
./getopt-sample-app -i 4             # same as above
./getopt-sample-app --instances 4    # same as above
./getopt-sample-app --instances=4    # same as above

./getopt-sample-app -di4
./getopt-sample-app -d -i4           # same as above
./getopt-sample-app -d -i 4          # same as above

# Execute commands below and look at the value of the 'keys' option:
./getopt-sample-app -i4                                                                # set via default config file
KEYS=from,env,var ./getopt-sample-app -i4                                              # set via env var
./getopt-sample-app -i4 -c config_sample_2.conf                                        # set via other config file
KEYS=from,env,var ./getopt-sample-app -i4 -c config_sample_2.conf                      # env var is higher prioritized than alternative config file
KEYS=from,env,var ./getopt-sample-app -i4 -c config_sample_2.conf --keys=from,option   # passing in option overwrites everything else
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