How do you check the current kernel parameters in a Linux system?

The command to check the current kernel parameters in a Linux system is "sysctl -a." This command displays all the kernel parameters along with their current values. Kernel parameters are settings that control various aspects of the kernel’s behavior and can be adjusted for tuning the performance or behavior of the system. Using "sysctl -a" is a standard method to obtain a comprehensive list of these parameters, which can then be modified when necessary using the "sysctl" command followed by the appropriate flags.

The alternative choices do not provide a complete or direct way to view kernel parameters. For instance, while "cat /proc/version" displays the kernel version along with some basic information about the Linux distribution, it does not list the full set of kernel parameters. Furthermore, options like "getkernel" and "checkparams" are not valid commands in standard Linux distributions, thus failing to provide any functional output for checking kernel parameters.