ntptime - read and set kernel time variables

### `ntptime` - read and set kernel time variables

from Pogo, Walt Kelly

The turtle has been swimming in the kernel.

Last update: 16:40 UTC Wednesday, March 12, 2008

#### Synopsis

`ntptime [ -chr ] [ -e est_error ] [ -f frequency ] [ -m max_error ] [ -o offset ] [ -s status ] [ -t time_constant]`

#### Description

This program is useful only with special kernels described in the A Kernel Model for Precision Timekeeping page. It reads and displays time-related kernel variables using the `ntp_gettime()` system call. A similar display can be obtained using the `ntpdc` program and `kerninfo` command.

#### Options

`-c`
  Display the execution time of `ntptime` itself.
`-e est_error`
  Specify estimated error, in microseconds.
`-f frequency`
  Specify frequency offset, in parts per million.
`-h`
  Display help information.
`-m max_error`
  Specify max possible errors, in microseconds.
`-o offset`
  Specify clock offset, in microseconds.
`-r`
  Display Unix and NTP times in raw format.
`-s status`
  Specify clock status. Better know what you are doing.
`-t time_constant`
  Specify time constant, an integer in the range 0-10.