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There are three tools that can be considered classic DNS tools: nslookup, dig and hostname.
nslookup is a network administration command-line tool available for many computer operating systems for querying the Domain Name System (DNS) to obtain domain name or IP address mapping or for any other specific DNS record.
Although dig is more convenient, you can get a version of a nameserver using nslookup:
> set q=txt
> set class=chaos
VERSION.BIND text = "8.2.2-P7"
Domain Information Groper (dig) is a network administration
command-line tool for querying Domain Name System (DNS) name servers for
any desired DNS records. See
dig - DNS lookup utility
Dig is useful for network troubleshooting and for educational purposes. Dig can operate in interactive command line mode or in batch mode by reading requests from an operating system file. When a specific name server is not specified in the command invocation, it will use the operating systems default resolver, usually configured via the resolv.conf file. Without any arguments it queries the DNS root zone.
Dig supports Internationalized Domain Name (IDN) queries.
Dig is part of the BIND domain name server software suite. Dig replaces older tools such as nslookup and the host program.
Network Ice Corporation. "dig." 2000.
URL: http://www.netice.com/advice/Reference/Tools/dig/default.htm (22 July, 2000).
The IP troubleshooters page contains a lot of interesting pointers on documents and tools, and to public gateways to use whois, nslookup, ping, traceroute.
digfe is a GUI interface for dig, the DNS client program. http://www.concoctedlogic.com/digfe/
hostname - show or set the system's host name
hostname [-v] [-a] [--alias] [-d] [--domain] [-f] [--fqdn] [-i] [--ip-address] [--long] [-s] [--short] [-y] [--yp] [--nis] [-n] [--node]
hostname [-v] [-F filename] [--file filename] [hostname]
hostname [-v] [-h] [--help] [-V] [--version]
Hostname is the program that is used to either set or display the current host, domain or node name of the system. These names are used by many of the networking programs to identify the machine. The domain name is also used by NIS/YP.
hostname will print the name of the system as returned by the gethostname(2) function.
The function gethostname(2) is used to get the hostname. Only when the hostname -s is called will gethostbyname(3) be called. The difference in gethostname(2) and gethostbyname(3) is that gethostbyname(3) is network aware, so it consults /etc/nsswitch.conf and /etc/host.conf to decide whether to read information in /etc/sysconfig/network or /etc/hosts the hostname is also set when the network interface is brought up.
Note, that only the super-user can change the names.
It is not possible to set the FQDN or the DNS domain name with the dnsdomainname command (see THE FQDN below).
The host name is usually set once at system startup in /etc/rc.d/rc.inet1 or /etc/init.d/boot (normally by reading the contents of a file which contains the host name, e.g. /etc/hostname).
Technically: The FQDN is the name gethostbyname(2) returns for the host name returned by gethostname(2). The DNS domain name is the part after the first dot.
Therefore it depends on the configuration (usually in /etc/host.conf) how you can change it. Usually (if the hosts file is parsed before DNS or NIS) you can change it in /etc/hosts.
Softpanorama hot topic of the month
hostname(1) show-set system's host name - Linux man page
Hostname - Wikipedia, the free encyclopedia
Domain Information Groper - Wikipedia, the free encyclopedia
nslookup - Wikipedia, the free encyclopedia
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Created May 16, 1996; Last modified: October 11, 2015