Which command can show current kernel parameters in Linux?

The command that shows current kernel parameters in Linux is "sysctl -a." This command provides a comprehensive view of all the kernel parameters, including both the values and their descriptions, making it a powerful tool for system tuning and analysis.

Using "sysctl -a", you are able to view runtime kernel parameters that can be modified to tune the performance and behavior of the Linux kernel. This command reads from the /proc/sys filesystem, which is where many of the kernel parameters are exposed. By accessing these parameters through sysctl, system administrators can gain insights into various system settings and make adjustments as needed.

The alternative choices each serve different purposes but are not primarily intended for displaying current kernel parameters in the same comprehensive manner. For instance, "cat /proc/cmdline" only displays the boot parameters that were passed to the kernel at the time of system startup, which does not reflect the current, runtime settings that could have changed. The term "kernel -parameters" is not a recognized command in Linux, and "dmesg" outputs kernel ring buffer messages which primarily include system and hardware message logs rather than the current parameters set for the kernel. Thus, "sysctl -a" is the most appropriate command for obtaining a full view