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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:
The Unix and Linux access rights flags setuid and setgid (short for set user identity and set group identity) [1] allow users to run an executable with the file system permissions of the executable's owner or group respectively and to change behaviour in directories. They are often used to allow users on a computer system to run programs with ...
The reason is that processes owned by the same user have the ability to send signals to each other and use debugging facilities to read or even modify each other's memory. Modern practice, as recommended by the Linux Standard Base , is to create a separate user account for each daemon.
The set user ID, setuid, or SUID mode. When a file with setuid is executed, the resulting process will assume the effective user ID given to the owner class. This enables users to be treated temporarily as root (or another user). The set group ID, setgid, or SGID permission.
Unique identifier for a specific user of a computer system; Unique ID for the Mifare series of chips (integrated circuits) used in contactless smart cards and proximity cards. Unique ID of a message in a folder on an IMAP server; User identifier (Unix), a code identifying each user on a Unix and Unix-like systems; Globally unique identifier (GUID)
In a Unix-like system users usually have a line in the /etc/passwd file for each local user like: foo:x:100:10:Foo Bar:/home/foo:/bin/sh This line is composed of seven colon-separated fields which hold the following data: user login name (string); password hash or "x" if shadow password file is in use (string); user id (unsigned integer);
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The Single UNIX Specification (SUS) specifies that who should list information about accessible users. The XSI extension also specifies that the data of the username, terminal, login time, process ID, and time since last activity occurred on the terminal, furthermore, an alternate system database used for user information can be specified as an optional argument to who.