func os.LookupEnv

3 uses

	os (current package)
		env.go#L112: func LookupEnv(key string) (string, bool) {

	net
		conf.go#L151: 	_, localDomainDefined := os.LookupEnv("LOCALDOMAIN")

	testing
		testing.go#L1328: 	prevValue, ok := os.LookupEnv(key)

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