Dig (domain information groper) gateway is a flexible tool part for the DNS name servers. It performs DNS lookups and displays the answers that are returned from the name server's that were queried. Most DNS administrators use dig to troubleshoot DNS problems because of its flexibility, ease of use and clarity of output. Other lookup tools tend to have less functionality than dig.
Dig is used with command-line arguments; it has batch mode of operation as well to reading lookup request files. A brief summary of its command-line arguments and options is printed when the -h option is given. Unlike earlier versions, the BIND9 implementation of dig allows multiple lookups to be issued from the command line performing an NS query for "." (The root).
The default for dig via ${HOME}/.digrc. This file is read and any options in it are applied before the command line arguments.
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