Section 7: overview, conventions, and miscellany
unicode – universal character set Description The international standard ISO 10646 defines the Universal Character Set (UCS). UCS contains all characters of all other character set standards. It also guarantees "round-trip compatibility"; in other words, conversion tables can be built such that no information is lost when a string is converted from any other encoding…
undocumented – No manpage for this program, utility or function. Description This program, utility or function does not have a useful manpage. Before opening a bug to report this, please check with the Debian Bug Tracking System (BTS) at <http://bugs.debian.org/> if a bug has already been reported. If not, you can submit a wishlist bug…
udplite – Lightweight User Datagram Protocol Synopsis #include <sys/socket.h> sockfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDPLITE); Description This is an implementation of the Lightweight User Datagram Protocol (UDP-Lite), as described in RFC 3828. UDP-Lite is an extension of UDP (RFC 768) to support variable-length checksums. This has advantages for some types of multimedia transport that may be…
udp – User Datagram Protocol for IPv4 Synopsis #include <sys/socket.h> #include <netinet/in.h> #include <netinet/udp.h> udp_socket = socket(AF_INET, SOCK_DGRAM, 0); Description This is an implementation of the User Datagram Protocol described in RFC 768. It implements a connectionless, unreliable datagram packet service. Packets may be reordered or duplicated before they arrive. UDP generates and checks checksums…
udisks – Storage Management Description udisks provides an interface to enumerate storage devices and perform operations on them. Any application can access the org.freedesktop.UDisks service on the system message bus. Some operations (such as formatting disks etc.) is restricted using polkit. Device Information On Linux, udisks relies on recent versions of udev(7) and the kernel….
udev – Dynamic device management Description udev supplies the system software with device events, manages permissions of device nodes and may create additional symlinks in the /dev/ directory, or renames network interfaces. The kernel usually just assigns unpredictable device names based on the order of discovery. Meaningful symlinks or network device names provide a way…
tuned-profiles – description of basic tuned profiles Description These are the base profiles which are mostly shipped in the base tuned package. They are targeted to various goals. Mostly they provide performance optimizations but there are also profiles targeted to low power consumption, low latency and others. You can mostly deduce the purpose of the…
tuned-profiles-origin-node – description of profiles provided for OpenShift Description These profiles are provided for OpenShift nodes. They provide performance optimizations for OpenShift Nodes running on either bare metal (origin-node-host) or virtual machines (origin-node-guest). Profiles The following profiles are provided: origin-node-host Profile optimized for OpenShift hosts (bare metal). It is based on throughput-performance profile. It additionally…
tuned-profiles-oracle – description of profiles provided for the Oracle Description These profiles are provided for the Oracle loads. Profiles The following profiles are provided: oracle Profile optimized for Oracle databases based on throughput-performance profile. It additionaly disables transparent huge pages and modifies some other performance related kernel parameters. Files /etc/tuned/* /usr/lib/tuned/* See Also tuned(8) tuned-adm(8)…
tuned-profiles-compat – description of profiles provided for backward compatibility Description These profiles are provided for backward compatibility with the tuned-1x. They are no longer mainained and may be dropped anytime in the future. It’s not recommended to use them for purposes other than backward compatibility. Some of them are only aliases to base tuned profiles….
tuned-profiles-atomic – description of profiles provided for the Project Atomic Description These profiles are provided for the Project Atomic. They provides performance optimizations for the Atomic hosts (bare metal) and virtual guests. Profiles The following profiles are provided: atomic-host Profile optimized for Atomic hosts (bare metal). It is based on throughput-performance profile. It additionally increases…
iso_8859-11 – ISO 8859-11 character set encoded in octal, decimal, and hexadecimal Description The ISO 8859 standard includes several 8-bit extensions to the ASCII character set (also known as ISO 646-IRV). ISO 8859-11 encodes the characters used in the Thai language. ISO 8859 alphabets The full set of ISO 8859 alphabets includes: ISO 8859-1 West…
time_namespaces – overview of Linux time namespaces Description Time namespaces virtualize the values of two system clocks: • CLOCK_MONOTONIC (and likewise CLOCK_MONOTONIC_COARSE and CLOCK_MONOTONIC_RAW), a nonsettable clock that represents monotonic time since—as described by POSIX—"some unspecified point in the past". • CLOCK_BOOTTIME (and likewise CLOCK_BOOTTIME_ALARM), a nonsettable clock that is identical to CLOCK_MONOTONIC, except that…
time – overview of time and timers Description Real time and process time Real time is defined as time measured from some fixed point, either from a standard point in the past (see the description of the Epoch and calendar time below), or from some point (e.g., the start) in the life of a process…
tigmanual – text-mode interface for Git Synopsis tig [options] [revisions] [–] [paths] tig show [options] [revisions] [–] [paths] tig blame [options] [rev] [–] path tig status tig < [Git command output] Description This is the manual for Tig, the ncurses-based text-mode interface for git. Tig allows you to browse changes in a Git repository and…
threedkit – a set of functions for 3D support. Description The 3dkit consists mainly of the following triangle functions gl_striangle(3), gl_swtriangle(3), gl_triangle(3), gl_trigetcolorlookup(3), gl_trisetcolorlookup(3), gl_trisetdrawpoint(3), gl_wtriangle(3). Beware, these functions are not a direct part of the svgalib library. Instead their source is part of svgalib and can be found in the threeDkit/ subdirectory of the…
thread-keyring – per-thread keyring Description The thread keyring is a keyring used to anchor keys on behalf of a process. It is created only when a thread requests it. The thread keyring has the name (description) _tid. A special serial number value, KEY_SPEC_THREAD_KEYRING, is defined that can be used in lieu of the actual serial…
termio – System V terminal driver interface Description termio is the name of the old System V terminal driver interface. This interface defined a termio structure used to store terminal settings, and a range of ioctl(2) operations to get and set terminal attributes. The termio interface is now obsolete: POSIX.1-1990 standardized a modified version of…
term – conventions for naming terminal types Description The environment variable TERM should normally contain the type name of the terminal, console or display-device type you are using. This information is critical for all screen-oriented programs, including your editor and mailer. A default TERM value will be set on a per-line basis by either /etc/inittab…
tcp – TCP protocol Synopsis #include <sys/socket.h> #include <netinet/in.h> #include <netinet/tcp.h> tcp_socket = socket(AF_INET, SOCK_STREAM, 0); Description This is an implementation of the TCP protocol defined in RFC 793, RFC 1122 and RFC 2001 with the NewReno and SACK extensions. It provides a reliable, stream-oriented, full-duplex connection between two sockets on top of ip(7), for…