This file shows the parameters passed to the kernel at the time it is started. A sample
/proc/cmdline file looks like the following:
ro root=/dev/VolGroup00/LogVol00 rhgb quiet 3
This tells us that the kernel is mounted read-only (signified by
(ro)), located on the first logical volume (
LogVol00) of the first volume group (
LogVol00 is the equivalent of a disk partition in a non-LVM system (Logical Volume Management), just as
/dev/VolGroup00 is similar in concept to
/dev/hda1, but much more extensible.
rhgb signals that the
rhgb package has been installed, and graphical booting is supported, assuming
/etc/inittab shows a default runlevel set to
quiet indicates all verbose kernel messages are suppressed at boot time.