butconfig

butconfig is a command-line utility used in some Unix-like operating systems, particularly those derived from older AT&T System V, to configure boot-time parameters for the kernel. It allows administrators to modify settings that affect how the operating system starts up, such as the kernel command line, which can include options for debugging, hardware initialization, or specifying the root filesystem.

The primary function of butconfig is to provide a persistent way to manage these boot parameters. Instead of editing the bootloader configuration directly, which can be complex and prone to errors, butconfig offers a simpler interface. It typically reads a configuration file and then updates the appropriate bootloader settings. The exact location and format of the configuration file can vary depending on the operating system and bootloader in use.

Common uses for butconfig include setting the kernel's console output device, specifying verbose boot messages for troubleshooting, or instructing the kernel to load specific modules at boot time. It can also be used to disable certain hardware or change the default behavior of system devices.

While powerful, butconfig should be used with caution. Incorrectly configured boot parameters can prevent the system from booting altogether. It is advisable to back up existing bootloader configurations before making changes and to understand the implications of each parameter before applying them. Its usage has become less common with the prevalence of GRUB and other modern bootloaders that offer their own configuration mechanisms.