reads  and  optionally  sets  adjustment parameters for the Linux
system clock.  This program provides shell‐level  access  to  the
system  call which actually manipulates the structure.  All para‐
meters are left alone unless asked to change with the correspond‐
ing option.  By default, the values of the  structure  on  return
from  are  printed,  along with helpful hints about what switches
control them.  Mortal users may view all these  parameters;  only
the superuser may change them.  quiet mode, do not print anything
Time offset in microseconds.  Frequency adjust, in integer kernel
units  (65536  units  is  one part‐per‐million).  Positive values
make the system clock run fast.  Microseconds per tick, nominally
10000.  Coarse corrections (within 100 ppm)  to  clock  frequency
are better made here than with Rate An independent implementation
of  similar  functionality was written by Steven Dick and Jim Van
Zandt, see Every writable member of the structure should be  set‐
table   from   this   program.   Larry  Doolittle  <larry@doolit‐
tle.boa.org>