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The magic SysRq key is a key combination understood by the Linux kernel, which allows the user to perform various low-level commands regardless of the system's state. It is often used to recover from freezes , or to reboot a computer without corrupting the filesystem . [ 1 ]
Many of these commands may be combined with ⇧ Shift to select a region of text. [13] [14] [notes 6] In macOS, holding ⌘ Command while dragging mouse can be used to invert selection, and holding ⌥ Option can be used to select by rectangular area in some apps. (These two functionalities may be combined).
2. On the keyboard, hold down the Command and Option keys, and then tap the esc key. In the Force Quit Applications window, click any program other than Finder to highlight it, and then click Force Quit. 3. Repeat until all programs other than Finder are closed, and then close the Force Quit Applications window by clicking the red dot on the ...
ipconfig in Mac OS X serves as a wrapper to the IPConfiguration agent, and can be used to control the Bootstrap Protocol and DHCP client from the command-line interface. [8] For example, you can release and renew an IP address if it happened to be assigned incorrectly by the DHCP server during the automated assignment process. [9]
Apple has made the source code of the Bonjour multicast DNS responder, the core component of service discovery, available as a Darwin open source project. The project provides source code to build the responder daemon for a wide range of platforms, including Mac OS 9, macOS, Linux, *BSD, Solaris, VxWorks, and Windows. Apple also provides a user ...
dnsmasq caches DNS records, reducing the load on upstream nameservers and improving performance, and can be configured to automatically pick up the addresses of its upstream servers. dnsmasq accepts DNS queries and either answers them from a small, local cache or forwards them to a real, recursive DNS server.
This is a list of commands from the GNU Core Utilities for Unix environments. These commands can be found on Unix operating systems and most Unix-like operating systems. GNU Core Utilities include basic file, shell and text manipulation utilities. Coreutils includes all of the basic command-line tools that are expected in a POSIX system.
dig is a network administration command-line tool for querying the Domain Name System (DNS).. dig is useful for network troubleshooting and for educational purposes. [2] It can operate based on command line option and flag arguments, or in batch mode by reading requests from an operating system file.