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Revert previous changeset: While using .Nm without an argument
in the SYNOPSIS is not strictly wrong, the conventional way is
to always state the name explicitely in the SYNOPSIS.

With help from Ingo Schwarze

.\"	$OpenBSD: ts.1,v 1.8 2022/07/03 16:55:39 job Exp $
.\"
.\" Copyright (c) 2022 Job Snijders <job@openbsd.org>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
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.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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.Dd $Mdocdate: July 3 2022 $
.Dt TS 1
.Os
.Sh NAME
.Nm ts
.Nd timestamp input
.Sh SYNOPSIS
.Nm ts
.Op Fl i | s
.Op Fl m
.Op Ar format
.Sh DESCRIPTION
The
.Nm
utility prepends a timestamp to each line of standard input and writes
it to standard output.
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl i
Display time elapsed since the last timestamp.
.It Fl m
Display timestamps derived from a strictly linearly increasing clock.
Without
.Fl m ,
timestamps reflect the current date and time, including time jumps if the
system time is changed.
.It Fl s
Display time elapsed since the start of the program.
.El
.Pp
The optional
.Ar format
argument controls how the timestamp is displayed, according to the conversion
specifications described in the
.Xr strftime 3
manual page.
The default format is
.Qq %b %d %H:%M:%S ;
or
.Qq %H:%M:%S
if one of the
.Fl i
or
.Fl s
options is used.
.Pp
Some additional conversion specifications are also supported
to append microsecond resolution:
.Cm %.S ,
.Cm %.s ,
and
.Cm %.T ;
which are similar to
.Cm %S ,
.Cm %s ,
and
.Cm \&%T .
Examples:
.Qq 10.00001 ,
.Qq 1656427781.00001 ,
and
.Qq 4:20:00.00001 .
.Sh EXAMPLES
.Bd -literal -offset indent
$ (echo foo; sleep 2; echo bar) | ts
Jun 28 12:13:38 foo
Jun 28 12:13:40 bar

$ ls | ts -i %.S
00.000452 CVS
00.000595 Makefile
00.000004 ts.1
00.000004 ts.c
.Ed
.Sh SEE ALSO
.Xr strftime 3
.Sh HISTORY
A
.Nm
utility first appeared in the moreutils collection by Joey Hess, and was
rewritten from scratch for
.Ox 7.2 .
.Sh AUTHORS
This
.Nm
utility was written by
.An Job Snijders Aq Mt job@openbsd.org
and
.An Claudio Jeker Aq Mt claudio@openbsd.org .