Does host command use etc hosts?
Since hosts does exclusively DNS lookups it does not peek into /etc/hosts to do the lookup.
How does the hostname command work?
hostname command in Linux is used to obtain the DNS(Domain Name System) name and set the system’s hostname or NIS(Network Information System) domain name. A hostname is a name which is given to a computer and it attached to the network. Its main purpose is to uniquely identify over a network.
How does hostname work in / etc / hosts?
/etc/hostnamecontains name of the machine, as known to applications that run locally. /etc/hostsand DNS associate names with IP addresses. mynamemay be mapped to whichever IP address the machine can access itself, but mapping it to 127.0.0.1is unæsthetic. Not /etc/hosts, but /bin/hostnameserves another function with -f.
What’s the difference between hostname and hostname-F?
In the example, the command hostname returns myname, whereas the command hostname -f returns localhost.localdomain. I had in mind that /etc/hosts was only a mapping between names and ip addresses. It seems to serve another function here. What is a fqdn and what is it used for?
How is the name of a host mapped to an IP address?
14 /etc/hostnamecontains name of the machine, as known to applications that run locally. /etc/hostsand DNS associate names with IP addresses. mynamemay be mapped to whichever IP address the machine can access itself, but mapping it to 127.0.0.1is unæsthetic.
What’s the difference between hostname and dnsmydomainis?
Both styles (⋯. TLD.and ⋯. TLD) are acceptable. The former is unambiguous, whereas the latter is ubiquitous. Don’t know what dnsmydomainis, but unlikely. Seeking something in /etc/hostsisn’t technically “DNS”. Remember the point 1. Hostname – for applications that run locally; also for such peculiar network protocols as SMB (samba).