mount_kernfs
—
mount the /kern file system
mount_kernfs |
[-o options]
/kern mount_point |
The mount_kernfs
command attaches an instance of the
kernel parameter namespace to the global filesystem namespace. The
conventional mount point is /kern. The directory
specified by mount_point is converted to an absolute
path before use. This command is normally executed by
mount(8) at boot time.
The filesystem includes several regular files which can be read,
some of which can also be written. The contents of the files is in a
machine-independent format, either a string, or an integer in decimal ASCII.
Where numbers are returned, a trailing newline character is also added.
The options are as follows:
-o
- Options are specified with a
-o
flag followed by a
comma separated string of options. See the
mount(8) man page for
possible options and their meanings.
- boottime
- the time at which the system was last booted (decimal ASCII).
- copyright
- kernel copyright message.
- hostname
- the hostname, with a trailing newline. The hostname can be changed by
writing to this file. A trailing newline will be stripped from the
hostname being written.
- hz
- the frequency of the system clock (decimal ASCII).
- loadavg
- the 1, 5 and 15 minute load average in kernel fixed-point format. The
final integer is the fix-point scaling factor. All numbers are in decimal
ASCII.
- msgbuf
- the kernel message buffer, also read by
syslogd(8), through the
log device, and by
dmesg(8).
- pagesize
- the machine pagesize (decimal ASCII).
- physmem
- the number of pages of physical memory in the machine (decimal
ASCII).
- rootdev
- the root device.
- rrootdev
- the raw root device.
- time
- the second and microsecond value of the system clock. Both numbers are in
decimal ASCII.
- version
- the kernel version string. The head line for
/etc/motd can be generated by running:
“
sed 1q /kern/version
”
The mount_kernfs
utility first appeared in
4.4BSD.
This filesystem may not be NFS-exported.