docs: Consistent style across watch.1

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ivan tkachenko 2020-12-06 14:17:23 +03:00 committed by Craig Small
parent fc93e2919d
commit bfaa431052

26
watch.1
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@ -1,4 +1,4 @@
.TH WATCH 1 "2020-10-19" "procps-ng" "User Commands"
.TH WATCH 1 "2020-12-06" "procps-ng" "User Commands"
.SH NAME
watch \- execute a program periodically, showing output fullscreen
.SH SYNOPSIS
@ -13,9 +13,9 @@ allows you to watch the program output change over time. By default,
\fIcommand\fR is run every 2 seconds and \fBwatch\fR will run until interrupted.
.SH OPTIONS
.TP
.BR \-d ", " \-\-differences [ =permanent ]
\fB\-d\fR, \fB\-\-differences\fR[=\fIpermanent\fR]
Highlight the differences between successive updates. If the optional
\fB=permanent\fR argument is specified then
\fIpermanent\fR argument is specified then
.B watch
will show all changes since the first iteration.
.TP
@ -31,8 +31,9 @@ Make
attempt to run
.I command
every
.I interval
seconds. Try it with
.B \-\-interval
.IR seconds .
Try it with
.B ntptime
(if present) and notice how the fractional seconds stays (nearly) the same, as opposed to
normal mode where they continuously increase.
@ -136,24 +137,25 @@ last column on the screen may display one column early, or they may not
display at all.
Combining Characters never count as different in
.I \-\-differences
.B \-\-differences
mode. Only the base character counts.
Blank lines directly after a line which ends in the last column do not
display.
.I \-\-precise
.B \-\-precise
mode doesn't yet have advanced temporal distortion technology to compensate
for a
.I command
that takes more than
.I interval
seconds to execute.
.B \-\-interval
.I seconds
to execute.
.B watch
also can get into a state where it rapid-fires as many executions of
.I command
as it can to catch up from a previous executions running longer than
.I interval
.B \-\-interval
(for example,
.B netstat
taking ages on a DNS lookup).
@ -180,7 +182,7 @@ watch echo '$$'
watch echo "'"'$$'"'"
.PP
To see the effect of precision time keeping, try adding
.I \-p
.B \-p
to
.IP
watch \-n 10 sleep 1
@ -190,7 +192,7 @@ You can watch for your administrator to install the latest kernel with
watch uname \-r
.PP
(Note that
.I \-p
.B \-p
isn't guaranteed to work across reboots, especially in the face of
.B ntpdate
(if present) or other bootup time-changing mechanisms)