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Modified date

Posted on 1997-06-18
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Last Modified: 2013-12-25
I got an modified guestbookscript. In this script I need an routine that print out the date plus a number. The number should increse with +1 per time the guestbook updates per day. ex. first input 970618-1, second input 970618-2 and the next day 970719-1.

                      Need help...
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Question by:jonasm
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by:julio011597
ID: 1828293
You should at least state your OS and programming language.

-julio
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Author Comment

by:jonasm
ID: 1828294
Using Linux and Perl
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julio011597 earned 250 total points
ID: 1828295
Here it is:

--//--
#!/usr/bin/perl

open(LOG, '+< counter.idx'); #open for update
$count = <LOG> + 1;
seek(LOG, 0, 0); #back to BOF
printf LOG $count;
close(LOG);

$year = (gmtime)[5];
$month = (gmtime)[4] + 1; #month and mday are 0 based
$mday = (gmtime)[3] + 1;

printf "$year%02d%02d-%d\n", $month, $mday, $count;

exit(0);
--//--

A few notes:

1. file 'counter.idx' must already exist, but may be empty, so you may create it with just a: touch counter.idx, then chmod 666 to make it updatable by all;

2. you may want to substitute gmtime() with localtime() to get local time instead that GMT time.

HTH, julio
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Author Comment

by:jonasm
ID: 1828296
when a new day comes the count must restart at ZZXXYY-1 and count up..

/Jonas
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Expert Comment

by:julio011597
ID: 1828297
Right, sorry...

since your program cannot be aware of a request to be the first of a day, you should set up cron to help it:

an easy way would be to put an empty - say - counter.0 file that cron could use to overwrite the counter.idx each midnight;

or, cron could delete counter.idx and touch it again;

or cron could run a script that writes a 0 in counter.idx (this needs a little modification of my first script).

I'm not on Linux, and the cron facility is quite dependent on the platform; you may want to have a look at man cron and man crontab for details.
If you have any problems, just feel free to ask more.

Rgds, julio
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Author Comment

by:jonasm
ID: 1828298
Ok, thanks on this system I don't have permissions to use crontab (argh!). Is there any way to do It inside the script? use another datafile to save the date in?
I need it, really (increased the points to), I would be very happy if you could help me..

rgds

/Jonas
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Expert Comment

by:julio011597
ID: 1828299
Yes, another way (maybe the best) is to also store the date into counter.idx:

--//--
#!/usr/bin/perl

open(LOG, '+< test.idx');
chop($oday = <LOG>);
$nday = (gmtime)[3];

if($oday ne $nday) {
  $count = "1";
  seek(LOG, 0, 0);
  printf LOG "%2d\n", $nday;
  printf LOG "%5d", $count;
}
else {
  $count = <LOG> + 1;
  seek(LOG, 0, 0);
  printf LOG "%2d\n", $oday;
  printf LOG "%5d", $count;
}
close(LOG);

$year = (gmtime)[5];
$month = (gmtime)[4] + 1;

printf "$year%02d%02d-%d\n", $month, $nday, $count;

exit(0);
--//--

This should work as expected :)
I put those printf() there, with field width specifiers, to be sure that each update completly overwrites the old data.
The count field width is set to 5: change it if you think you'll get more than 99999 requests a day.

Cheers, julio
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Author Comment

by:jonasm
ID: 1828300
Exactly what I needed!,
Thanks for the fast replys!

/Jonas
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