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The cron command-line utility is a job scheduler on Unix-like operating systems.Users who set up and maintain software environments use cron to schedule jobs [1] (commands or shell scripts), also known as cron jobs, [2] [3] to run periodically at fixed times, dates, or intervals. [4]
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 ]
nohup is a POSIX command which means "no hang up". Its purpose is to execute a command such that it ignores the HUP (hangup) signal and therefore does not stop when the user logs out. Output that would normally go to the terminal goes to a file called nohup.out, if it has not already been redirected.
Commands – Unix makes little distinction between commands (user-level programs) for system operation and maintenance (e.g. cron), commands of general utility (e.g. grep), and more general-purpose applications such as the text formatting and typesetting package. Nonetheless, some major categories are:
systemctl is a command to introspect and control the state of the systemd system and service manager. Not to be confused with sysctl . systemd-analyze may be used to determine system boot-up performance statistics and retrieve other state and tracing information from the system and service manager.
Bypassing a real reboot may leave devices in an unknown state, and the new kernel will have to recover from that. Support for allowing only signed kernels to be booted through kexec was merged into version 3.17 of the Linux kernel mainline , which was released on October 5, 2014. [ 3 ]
More commonly, the desired command names are linked (using hard or symbolic links) to the BusyBox executable; BusyBox reads argv[0] to find the name by which it is called, and runs the appropriate command, for example just /bin/ls. after /bin/ls is linked to /bin/busybox. This works because the first argument passed to a program is the name ...
• Cron job to clean old Audits • Provisioning snippets support Puppet 7 • Performance improvements for index pages and Host Config Status • Dropped support for running Foreman on Ubuntu 18.04 • Deprecated the :unattended setting 15 March 2022 [9] 3.2.0 [16] • Debian 11 (Bullseye) support • require_ssl_smart_proxies setting dropped