HOSTS parameter*    ==  HOSTS=nameList[/addrList]
          nameList  ==  name | {name[,name]*}
          addrList  ==  addr | {addr[,addr]*}
                    --  default: HOSTS=localhost/127.0.0.1

List of domain-names/IP-addresses pairs which will override DNS (or NIS or /etc/hosts table) data. This could be used for speed-up of resolution for frequently referred hosts, aliasing, or relief of unknown hosts by any resolvers. Multiple names or addresses could be specified in the form {name1,name2,...}/{addr1,addr2,...}. If only {name1,name2,...} is given without addr part, it makes name1,name2,... be regarded as a single host.