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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.
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.
The Berkeley r-commands are a suite of computer programs designed to enable users of one Unix system to log in or issue commands to another Unix computer via TCP/IP computer network. [1] The r-commands were developed in 1982 by the Computer Systems Research Group at the University of California, Berkeley , based on an early implementation of ...
In Linux, if the script was executed by a regular user, the shell would attempt to execute the command rm -rf / as a regular user, and the command would fail. However, if the script was executed by the root user, then the command would likely succeed and the filesystem would be erased. It is recommended to use sudo on a per-command basis instead.
command > file1 executes command, placing the output in file1, as opposed to displaying it at the terminal, which is the usual destination for standard output. This will clobber any existing data in file1. Using command < file1 executes command, with file1 as the source of input, as opposed to the keyboard, which is the usual source for ...
The command command in Unix and Unix-like operating systems is a utility to execute a command. It is specified in the POSIX standard. It is present in Unix shells as a shell builtin function. The argument(s) passed is a command with its arguments. The passed command is run with the normal shell function lookup suppressed.
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 ]
Additional to sar command, Linux sysstat package in Debian, [4] RedHat Enterprise Linux and SuSE provides additional reporting tools: : Collect, report, or save system activity information. – Linux User Commands Manual: Collect and store binary data in the system activity daily data file.