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Update to match revision 1.23 of touch.c.

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Clarify some details.
This commit is contained in:
Greg Lehey 2007-04-10 07:24:47 +00:00
parent 1b54381b5a
commit 5abc1de430
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=168572
1 changed files with 18 additions and 36 deletions
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54
usr.bin/touch/touch.1
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@ -63,25 +63,23 @@ and
flags may be used to select the access time or the modification time
individually.
Selecting both is equivalent to the default.
The base times for the modification are both set to the current time.
By default, the timestamps are set to the current time.
The
.Fl t
flag explicitly specifies a single time for both values, and the
flag explicitly specifies a different time, and the
.Fl r
flag specifies to set the times from those of a different file.
flag specifies to set the times those of the specified file.
The
.Fl A
flag adjusts the values by a specified amount.
This adjustment is done after first establishing the base times.
.Pp
The following options are available:
.Bl -tag -width Ds
.It Fl A
Adjust the access and modification time stamps for the file by the
specified value.
This flag is intended for use in modifying files with a time stamp
relative to an incorrect time zone.
It always modifies both the access time and the modification time.
This flag is intended for use in modifying files with incorrectly set
time stamps.
.Pp
The argument is of the form
.Dq [-][[hh]mm]SS
@ -92,38 +90,23 @@ where each pair of letters represents the following:
Make the adjustment negative: the new time stamp is set to be before
the old one.
.It Ar hh
The hour of the day, from 00 to 23.
The number of hours, from 00 to 99.
.It Ar mm
The minute of the hour, from 00 to 59.
The number of minutes, from 00 to 59.
.It Ar SS
The second of the minute, from 00 to 59.
The number of seconds, from 00 to 59.
.El
.Pp
When used in conjunction with the
.Fl a
flag only, the modification time is adjusted by the time specified as
argument to the
The
.Fl A
flag, while the access time is modified from the base time described
above.
Similarly, when used in conjunction with the
.Fl m
flag only, the access time is adjusted by the time specified as
argument to the
.Fl A
flag, while the access time is modified from the base time described
above.
.Pp
If the file does not exist, and creation is allowed,
.Fl A
does not change its time stamps.
flag implies the
.Fl c
flag: if any file specified does not exist, it will be silently ignored.
.It Fl a
Change the access time of the file.
The modification time of the file is not changed unless one of the
.Fl A
or
The modification time of the file is not changed unless the
.Fl m
flags is also specified.
flag is also specified.
.It Fl c
Do not create the file if it does not exist.
The
@ -143,16 +126,15 @@ implies
and thus will not create any new files.
.It Fl m
Change the modification time of the file.
The access time of the file is not changed unless one of the
.Fl A
or
The access time of the file is not changed unless the
.Fl a
flags is also specified.
flag is also specified.
.It Fl r
Use the access and modifications times from the specified file
instead of the current time of day.
.It Fl t
Change the access and modification times to the specified time.
Change the access and modification times to the specified time instead
of the current time of day.
The argument is of the form
.Dq [[CC]YY]MMDDhhmm[.SS]
where each pair of letters represents the following: