build
go build rwlook.go
-> ./rwlook /var/www
/var/www/html/index.html [readable/writable]
/var/www/html/index.nginx-debian.html [readable/writable]
build
go build rwlook.go
-> ./rwlook /var/www
/var/www/html/index.html [readable/writable]
/var/www/html/index.nginx-debian.html [readable/writable]