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The crontab files are stored where the lists of jobs and other instructions to the cron daemon are kept. Users can have their own individual crontab files and often there is a system-wide crontab file (usually in /etc or a subdirectory of /etc e.g. /etc/cron.d) that only system administrators can edit. [note 1]
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 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 ]
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.
Most tasks [a] (directory listing, editing files, etc.) can easily be accomplished by letting the program take control of the terminal and returning control to the shell when the program exits – formally, by attaching to standard input and standard output to the shell, which reads or writes from the terminal, and catching signals sent from ...
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 has been renamed back to util-linux, and is the official version of the package.
As with cron, many Unix systems allow the administrator to restrict access to the at command. at can be made to mail a user when done carrying out a scheduled job, can use more than one job queue, and can read a list of jobs to carry out from a file instead of standard input. The Linux at command was mostly written by Thomas Koenig. [3]
The common practice of mounting users' home directories via Network File System exposes rlogin to attack by means of fake .rhosts files - this means that any of its security faults automatically plague rlogin. Due to these problems, the r-commands fell into relative disuse (with many Unix and Linux distributions no longer including them by ...