CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -o auth_server authenticate_server.go
CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build -a -o libmqtt github.com/goiiot/libmqtt/cmd/libmqtt
go build
nohup $COMMAND >nohup.out 2>&1 &
package import
var constant int/uint bool string true false
struct func return struct type interface defer
switch case fallthrough default if else
for continue break
[] map chan make new