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Then, if hostname is given (not NULL), a call to gethostbyname() resolves it, or otherwise the address 0.0.0.0 is used, if hints->ai_flags is set to AI_PASSIVE, and 127.0.0.1 otherwise. It allocated a new addrinfo structure filled with the appropriate sockaddr_in in one of these conditions and also adds the port retrieved at the beginning to it
dig, a utility interrogates DNS servers directly for troubleshooting and system administration purposes. nslookup, another utility that can be used to obtain similar information; Root name server - top-level name servers providing top level domain name resolution; List of DNS record types - possible types of records stored and queried within ...
The Linux operating system is based on this kernel and deployed on both traditional computer systems such as personal computers and servers, usually in the form of Linux distributions (including Ubuntu and its derivatives), and on various embedded devices such as routers, wireless access points, PBXes, set-top boxes, FTA receivers, smart TVs ...
A Unix shell is a command-line interpreter or shell that provides a command line user interface for Unix-like operating systems. The shell is both an interactive command language and a scripting language, and is used by the operating system to control the execution of the system using shell scripts. [2]
The hosts file is one of several system facilities that assists in addressing network nodes in a computer network. It is a common part of an operating system's Internet Protocol (IP) implementation, and serves the function of translating human-friendly hostnames into numeric protocol addresses, called IP addresses, that identify and locate a host in an IP network.
tty — Show filename of terminal connected to stdin. tunctl — Create and delete tun/tap virtual Ethernet devices. ulimit — Print or set resource limits for process number PID. umount — Unmount the listed filesystems. uname — Print system information. unicode — universal character set. uniq — Report or filter out repeated lines in a ...
Some Unix variants, such as AT&T UNIX System V Release 3.0, include the related setname program, used to change the values that uname reports.; The ver command found in operating systems such as DOS, OS/2 and Microsoft Windows is similar to the uname command.
Ubuntu is by far the most popular Linux distribution for running web servers; of the websites they analyse it is "used by 47.3% of all the websites who use Linux", [160] and Ubuntu alone powers more websites than Microsoft Windows, which powers 28.2% of all websites, or 39% of the share Unix has (which includes Linux and thus Ubuntu). All Linux ...