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This is a list of POSIX (Portable Operating System Interface) commands as specified by IEEE Std 1003.1-2024, which is part of the Single UNIX Specification (SUS). These commands can be found on Unix operating systems and most Unix-like operating systems.
Name Description chcon: Changes file security context chgrp: Changes file group ownership chown: Changes file ownership chmod: Changes the permissions of a file or directory cp: Copies a file or directory dd: Copies and converts a file df: Shows disk free space on file systems dir: Is exactly like "ls -C -b". (Files are by default listed in ...
The Linux Assigned Names and Numbers Authority (LANANA) is a central registry of names and numbers used within Linux.It was created in 2000 by H. Peter Anvin.As of 2013, it along with Filesystem Hierarchy Standard matters had moved under the Linux Standard Base, which itself operates under Linux Foundation's auspices per Russ Herrold.
65,534: The Linux kernel defaults to 2 16 −2 = 65,534 (which many Linux distributions map to the group name "nogroup") when a 32-bit GID does not fit into the return value of a 16-bit system call. [4] The value is also returned by idmapd if a group name in an incoming NFSv4 packet does not match any known group on the system.
instruct the directory command to also display the ownership of the files. Note the Directory command name is not case sensitive, and can be abbreviated to as few letters as required to remain unique. Windows: DIR/Q/O:S d* dir /q d* /o:s: display ownership of files whose names begin with D, sorted by size, smallest first.
The setuid and setgid bits are normally represented as the values 4 for setuid and 2 for setgid in the high-order octal digit of the file mode. For example, 6711 has both the setuid and setgid bits (4 + 2 = 6) set, and also the file read/write/executable for the owner (7), and executable by the group (first 1) and others (second 1).
The most common special file is the directory. The layout of a directory file is defined by the filesystem used. As several filesystems are available under Unix, both native and non-native, there is no one directory file layout. A directory is marked with a d as the first letter in the mode field in the output of ls -dl [5] or stat, e.g.
Modern Linux distributions include a /sys directory as a virtual filesystem (sysfs, comparable to /proc, which is a procfs), which stores and allows modification of the devices connected to the system, [20] whereas many traditional Unix-like operating systems use /sys as a symbolic link to the kernel source tree.