test the file date

test the file date

[César Soler]

Hi,

I would like to process a pair of files if they were modified in the
previous day. I have tried with "find", but the problem is that I only
need two files:

$PATH/file
$PATH/backup/file
$PATH/export/file

if I find from "$PATH" all files, with name "file" and "-mtime -1", at
least three files appear, but I only need two of them.

Is there any shell tool to check the date? something likes "test" or
"file", that is able to check the modified time....

any clue is welcome!
Thks in advance

-- 
Best regards,
 César                          mailto:csoler@euskalnet.net


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Re: test the file date

[Joakim Ryden]

On Tue, 2003-06-10 at 02:50, César Soler wrote:
[...]
> Is there any shell tool to check the date? something likes "test" or
> "file", that is able to check the modified time....

'stat' will give you a lot of information, including modified time. The
correct options to 'ls' will as well.

--Jo

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Re[2]: test the file date

[César Soler]

Hello Joakim,

the problem with 'ls' is that I should get the output and view if the
file was modified into the previous day.
how could I call c functions from a shell?

thks for your help!

Tuesday, June 10, 2003, 11:49:47 AM, you wrote:

JR> On Tue, 2003-06-10 at 02:50, César Soler wrote:
JR> [...]
>> Is there any shell tool to check the date? something likes "test" or
>> "file", that is able to check the modified time....

JR> 'stat' will give you a lot of information, including modified time. The
JR> correct options to 'ls' will as well.

JR> --Jo


-- 
Best regards,
 César                            mailto:csoler@euskalnet.net


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Re: test the file date

[Glynn Clements]

César Soler wrote:

> I would like to process a pair of files if they were modified in the
> previous day. I have tried with "find", but the problem is that I only
> need two files:
> 
> $PATH/file
> $PATH/backup/file
> $PATH/export/file
> 
> if I find from "$PATH" all files, with name "file" and "-mtime -1", at
> least three files appear, but I only need two of them.
> 
> Is there any shell tool to check the date? something likes "test" or
> "file", that is able to check the modified time....

"test file1 -nt file2" is true if file1 is newer than file2;
conversely for "-ot".

You can create a file with a specified timestamp with "touch t <date>".

OTOH, you can pass the full pathname to find, e.g.

	find /path/to/file -mtime -1

This will output either one filename or nothing.

-- 
Glynn Clements <glynn.clements@virgin.net>
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Re: test the file date

[Stephen Samuel]

César Soler wrote:
> Hi,
> 
> I would like to process a pair of files if they were modified in the
> previous day. I have tried with "find", but the problem is that I only
> need two files:
> 
> $PATH/file
> $PATH/backup/file
> $PATH/export/file
> 
> if I find from "$PATH" all files, with name "file" and "-mtime -1", at
> least three files appear, but I only need two of them.
> 
> Is there any shell tool to check the date? something likes "test" or
> "file", that is able to check the modified time....
> 
> any clue is welcome!
> Thks in advance
> 

it's kinda hard to figure what you mean by 'test the date'...
If you're looking for something that was made 'today', then you
could do something like:

thismorn=`date +%y%m%d`
testfile=`mktmp /tmp/today.XXXXXX`
touch -t "$thismorn"0000  $testfile

find /some/path -newer $testfile  -print
rm $testfile

Note that it takes a bit more magic to  properly come up with
a date string for yesterday... I can think of a perl script
that could do it:
-----------------------
#!/usr/bin/perl
die "Usage: $0 number_of_days_ago\n"
$days_ago=$ARGV[0];
( $sec, $min,$hour,$mday,$mon,$year ) = localtime(time-$days_ago*3600*24);
printf "%02d%02d%02d\n", $year % 100 , $mon+1, $mday;
-----------------------

(in perl, the year is years since 1900, so 2003 comes out as 103.
     Months are based on january being month 0, so 1 must be added
     to the month. I take $year mod 100 rather than blindly
     subtracting 100
)

note that all of these presume that you calculate the date based
on your local time.  If you want it based on some other time, then
you should set (and export) TZ to be the appropriate timezone.
eg:
   export TZ=GMT  	# Greenwich Mean Time
	or
   export TZ=EST5EDT	# Eastern Standard / daylight time.
   sxport TZ=MST7	# Mountain Standard time (no daylight savings)

If you put the perlscript in the file saysago (somewhere in your
path), then the usage would be: touch `daysago 1`0000 `mktemp /tmp/


er, um, then again, you could just read the man page for find,
and notice that you've got a -daystart option, which says to
count file age starting at midnight, tonight rather than
the current time. (time zones still apply)

(Note: this solution -- while the quickest and easiest may not be
portable to commercial (non-GNU) versions of the UNIX find(1) command)

In other words...

find /some/path  -daystart -mtime -1 -print

-- 
Stephen Samuel +1(604)876-0426                samuel@bcgreen.com
		   http://www.bcgreen.com/~samuel/
Powerful committed communication, reaching through fear, uncertainty and
doubt to touch the jewel within each person and bring it to life.

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Re: test the file date

[Mr. James W. Laferriere]

On Tue, 10 Jun 2003, Stephen Samuel wrote:
> César Soler wrote:
> > Hi,
> > I would like to process a pair of files if they were modified in the
> > previous day. I have tried with "find", but the problem is that I only
> > need two files:
> > $PATH/file
> > $PATH/backup/file
> > $PATH/export/file
> > if I find from "$PATH" all files, with name "file" and "-mtime -1", at
> > least three files appear, but I only need two of them.
> > Is there any shell tool to check the date? something likes "test" or
> > "file", that is able to check the modified time....
> > any clue is welcome!
> > Thks in advance

> it's kinda hard to figure what you mean by 'test the date'...
> If you're looking for something that was made 'today', then you
> could do something like:

> thismorn=`date +%y%m%d`
> testfile=`mktmp /tmp/today.XXXXXX`
> touch -t "$thismorn"0000  $testfile
> find /some/path -newer $testfile  -print
> rm $testfile
> Note that it takes a bit more magic to  properly come up with
> a date string for yesterday... I can think of a perl script
> that could do it:
> -----------------------
> #!/usr/bin/perl
> die "Usage: $0 number_of_days_ago\n"
> $days_ago=$ARGV[0];
> ( $sec, $min,$hour,$mday,$mon,$year ) = localtime(time-$days_ago*3600*24);
> printf "%02d%02d%02d\n", $year % 100 , $mon+1, $mday;
> -----------------------
	Try using gdate(date) like so .
	date "+%y%m%d" --date="1 days ago"


> (in perl, the year is years since 1900, so 2003 comes out as 103.
>      Months are based on january being month 0, so 1 must be added
>      to the month. I take $year mod 100 rather than blindly
>      subtracting 100
> )
>
> note that all of these presume that you calculate the date based
> on your local time.  If you want it based on some other time, then
> you should set (and export) TZ to be the appropriate timezone.
> eg:
>    export TZ=GMT  	# Greenwich Mean Time
> 	or
>    export TZ=EST5EDT	# Eastern Standard / daylight time.
>    sxport TZ=MST7	# Mountain Standard time (no daylight savings)
>
> If you put the perlscript in the file saysago (somewhere in your
> path), then the usage would be: touch `daysago 1`0000 `mktemp /tmp/
>
>
> er, um, then again, you could just read the man page for find,
> and notice that you've got a -daystart option, which says to
> count file age starting at midnight, tonight rather than
> the current time. (time zones still apply)
>
> (Note: this solution -- while the quickest and easiest may not be
> portable to commercial (non-GNU) versions of the UNIX find(1) command)
>
> In other words...
>
> find /some/path  -daystart -mtime -1 -print
>
>

-- 
       +------------------------------------------------------------------+
       | James   W.   Laferriere | System    Techniques | Give me VMS     |
       | Network        Engineer |     P.O. Box 854     |  Give me Linux  |
       | babydr@baby-dragons.com | Coudersport PA 16915 |   only  on  AXP |
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Re: test the file date

[Stephen Samuel]

Mr. James W. Laferriere wrote:
 > On Tue, 10 Jun 2003, Stephen Samuel wrote:

 >>Note that it takes a bit more magic to  properly come up with
 >>a date string for yesterday... I can think of a perl script
 >>that could do it:
 >>-----------------------
 >>#!/usr/bin/perl
 >>die "Usage: $0 number_of_days_ago\n"
 >>$days_ago=$ARGV[0];
 >>( $sec, $min,$hour,$mday,$mon,$year ) = localtime(time-$days_ago*3600*24);
 >>printf "%02d%02d%02d\n", $year % 100 , $mon+1, $mday;
 >>-----------------------
 >
 > 	Try using gdate(date) like so .
 > 	date "+%y%m%d" --date="1 days ago"

Yay! they've modularized the date-pareing functions of 'at'!

-- 
Stephen Samuel +1(604)876-0426                samuel@bcgreen.com
		   http://www.bcgreen.com/~samuel/
Powerful committed communication, reaching through fear, uncertainty and
doubt to touch the jewel within each person and bring it to life.