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The cron in Version 7 Unix was a system service (later called a daemon) invoked from /etc/rc when the operating system entered multi-user mode. [10] Its algorithm was straightforward: Read /usr/lib/crontab [11] Determine if any commands must run at the current date and time, and if so, run them as the superuser, root. Sleep for one minute
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.
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.
Stand-alone shell (sash) is a Unix shell designed for use in recovering from certain types of system failures and errors.. The built-in commands of sash have all libraries linked statically, so unlike most shells on Linux, the standard UNIX commands do not rely on external libraries.
On some systems, the cron daemon does this, and on Linux it was handled by the pdflush daemon which was replaced by a new implementation and finally removed from the Linux kernel in 2012. [3] Buffers are also flushed when filesystems are unmounted or remounted read-only , [ 4 ] for example prior to system shutdown.
systemd tracks processes using the Linux kernel's cgroups subsystem instead of using process identifiers (PIDs); thus, daemons cannot "escape" systemd, not even by double-forking. systemd not only uses cgroups, but also augments them with systemd-nspawn and machinectl , two utility programs that facilitate the creation and management of Linux ...
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 ]
util-linux is a standard package distributed by the Linux Kernel Organization for use as part of the Linux operating system. A fork , util-linux-ng (with ng meaning "next generation"), was created when development stalled, [ 4 ] but as of January 2011 [update] has been renamed back to util-linux , and is the official version of the package.