(Alpha only); compare the System and Hardware Clocks; and predict future
Hardware Clock values based on its drift rate.
.PP
-Since v2.26
-.B hwclock
-does not update the Hardware Clock's drift factor in @ADJTIME_PATH@ by default.
-It is necessary to use \fB\-\-update-drift\fR, with \fB\-\-set\fR or
-\fB\-\-systohc\fR, to force drift factor updates.
-See the \fB\-\-update\-drift\fR option below for details.
-.PP
-Since v2.26
-.B hwclock \-\-hctosys
-does a better job at setting the System Clock: it no longer simply copies
-the time from the Hardware Clock to the System Clock, but sets the System
-Clock to a drift-compensated time. (That is: it reads the Hardware Clock,
-applies a compensation for the systematic drift to this read time, and
-then sets the System Clock to the resulting value.)
-Therefore it is no longer necessary to run \fBhwclock --adjust\fR before
-doing \fBhwclock --hctosys\fR, and thus \fBhwclock\fR can be used very
-early on in the boot process when the root filesystem is still read-only.
-See the \fB\-\-hctosys\fR function below for information on inhibiting
-this new behavior.
+Since v2.26 important changes were made to the
+.B \-\-hctosys
+function, and the new option
+.B \-\-update\-drift
+was added. See their respective sections below.
.
.SH FUNCTIONS
The following functions are mutually exclusive, only one can be given at