args, err := shellwords.Parse("./foo --bar=baz")
// args should be ["./foo", "--bar=baz"]

envs, args, err := shellwords.ParseWithEnvs("FOO=foo BAR=baz ./foo --bar=baz")
// envs should be ["FOO=foo", "BAR=baz"]
// args should be ["./foo", "--bar=baz"]

os.Setenv("FOO", "bar")
p := shellwords.NewParser()
p.ParseEnv = true
args, err := p.Parse("./foo $FOO")
// args should be ["./foo", "bar"]

p := shellwords.NewParser()
p.ParseBacktick = true
args, err := p.Parse("./foo `echo $SHELL`")
// args should be ["./foo", "/bin/bash"]

shellwords.ParseBacktick = true
p := shellwords.NewParser()
args, err := p.Parse("./foo `echo $SHELL`")
// args should be ["./foo", "/bin/bash"]