$ AWS_PROFILE=myprofile aws configure get region
ap-northeast-1
$ AWS_PROFILE=myprofile s3-edit edit s3://tsub-sandbox/test.txt
MissingRegion: could not find region configuration

$ AWS_PROFILE=myprofile AWS_REGION=ap-northeast-1 s3-edit edit s3://tsub-sandbox/test.txt
NoCredentialProviders: no valid providers in chain. Deprecated.
        For verbose messaging see aws.Config.CredentialsChainVerboseErrors

$ AWS_PROFILE=myprofile go run main.go edit s3://tsub-sandbox/test.txt # is working

$ AWS_PROFILE=myprofile aws configure get region
ap-northeast-1