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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 ]
For example, prior to OpenWrt 8.09 (based on Linux 2.6.25 and the b43 kernel module) WLAN for many Broadcom-based routers could only be had via the proprietary wl.o module (and which required Linux 2.4.x). OpenWrt releases were historically named after cocktails, such as White Russian, Kamikaze, Backfire, Attitude Adjustment, Barrier Breaker ...
Notable custom-firmware projects for wireless routers.Many of these will run on various brands such as Linksys, Asus, Netgear, etc. OpenWrt – Customizable FOSS firmware written from scratch; features a combined SquashFS/JFFS2 file system and the package manager opkg [1] with over 3000 available packages (Linux/GPL); now merged with LEDE.
Gargoyle is a free OpenWrt-based Linux distribution for a range of wireless routers based on Broadcom, Atheros, MediaTek and others chipsets, [2] [3] Asus Routers, Netgear, Linksys and TP-Link routers. Among notable features is the ability to limit and monitor bandwidth and set bandwidth caps per specific IP address. [4] [5] [6] [7]
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]
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 ]
BusyBox is a software suite that provides several Unix utilities in a single executable file.It runs in a variety of POSIX environments such as Linux, Android, [8] and FreeBSD, [9] although many of the tools it provides are designed to work with interfaces provided by the Linux kernel.
With the decline of access via serial line, the meaning of SIGHUP has changed somewhat on modern systems, often meaning a controlling pseudo or virtual terminal has been closed. If a command is executed inside a terminal window and the terminal window is closed while the command process is still running, it receives SIGHUP. [1]