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sudo (/ s uː d uː / [4]) is a program for Unix-like computer operating systems that enables users to run programs with the security privileges of another user, by default the superuser. [5] It originally stood for "superuser do", [ 6 ] as that was all it did, and this remains its most common usage; [ 7 ] however, the official Sudo project ...
In many Unix variants, "nobody" is the conventional name of a user identifier which owns no files, is in no privileged groups, and has no abilities except those which every other user has. It is normally not enabled as a user account, i.e. has no home directory or login credentials assigned.
When new users are created locally, the local system is supposed to check for and avoid conflicts with UID's already existing on NSS' [9] OS-level virtualization can remap user identifiers, e.g. using Linux namespaces, and therefore need to allocate ranges into which remapped UIDs and GIDs are mapped:
Ubuntu (/ ʊ ˈ b ʊ n t uː / ⓘ uu-BUUN-too) [8] is a Linux distribution derived from Debian and composed mostly of free and open-source software. [9] [10] [11] Ubuntu is officially released in multiple editions: Desktop, [12] Server, [13] and Core [14] for Internet of things devices [15] and robots.
A runlevel is a mode of operation in the computer operating systems that implements Unix System V-style initialization.Conventionally, seven runlevels exist, numbered from zero to six.
For every current user or process, SELinux assigns a three string context consisting of a username, role, and domain (or type). This system is more flexible than normally required: as a rule, most of the real users share the same SELinux username, and all access control is managed through the third tag, the domain.
On Internet Relay Chat (IRC), the real name field is sometimes referred to as the gecos field. IRC clients are able to supply this field when connecting. Hexchat, an X-Chat fork, defaults to 'realname', TalkSoup.app on GNUstep defaults to 'David Okeamah', and irssi reads the operating system user's full name, replacing it with 'unknown' if not defined.
In software development, time-of-check to time-of-use (TOCTOU, TOCTTOU or TOC/TOU) is a class of software bugs caused by a race condition involving the checking of the state of a part of a system (such as a security credential) and the use of the results of that check.