The file that lists parameters passed from the bootloader to the kernel in the /proc filesystem is /proc/cmdline. The /proc/cmdline file contains the command-line parameters that were passed to the kernel by the bootloader at boot time. These parameters can be used to configure the kernel and set options for the operating system. They can be viewed by using the cat command to display the contents of the /proc/cmdline file. For example: cat /proc/cmdline