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Top Forums Shell Programming and Scripting Compare file dates before copy Post 303021424 by drew77 on Thursday 9th of August 2018 08:22:04 AM
Old 08-09-2018
Compare file dates before copy

Sometimes when I boot, my system goes into emergency mode.

I then use Clonezilla to restore an image.

Usually the image is older than the current date.

This is part of a backup script that runs as a startup program.

Code:
cd /home/andy/bin/
zip -u -q Ubuntu_Scripts.zip *.sh *.rb *.c *.py *.txt
cp -u Ubuntu_Scripts.zip /media/andy/MAXTOR_SDB1/Ubuntu_Mate_18.04/
cp -u Ubuntu_Scripts.zip /media/andy/MAXTOR_SDB5/Emergency_Backup/

This then overwrites my zip file with one that is in fact older.

I thought that if I could compare the file dates, before the zip operation, I could prevent the overwriting.
 

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DATETIME.SETTIMESTAMP(3)						 1						  DATETIME.SETTIMESTAMP(3)

DateTime::setTimestamp - Sets the date and time based on an Unix timestamp

       Object oriented style

SYNOPSIS
public DateTime DateTime::setTimestamp (int $unixtimestamp) DESCRIPTION
Procedural style DateTime date_timestamp_set (DateTime $object, int $unixtimestamp) Sets the date and time based on an Unix timestamp. PARAMETERS
o $object -Procedural style only: A DateTime object returned by date_create(3). The function modifies this object. o $unixtimestamp - Unix timestamp representing the date. RETURN VALUES
Returns the DateTime object for method chaining or FALSE on failure. EXAMPLES
Example #1 DateTime.setTimestamp(3) example Object oriented style <?php $date = new DateTime(); echo $date->format('U = Y-m-d H:i:s') . " "; $date->setTimestamp(1171502725); echo $date->format('U = Y-m-d H:i:s') . " "; ?> Procedural style <?php $date = date_create(); echo date_format($date, 'U = Y-m-d H:i:s') . " "; date_timestamp_set($date, 1171502725); echo date_format($date, 'U = Y-m-d H:i:s') . " "; ?> The above examples will output something similar to: 1272508903 = 2010-04-28 22:41:43 1171502725 = 2007-02-14 20:25:25 NOTES
Using the Unix timestamp format to construct a new DateTime object is an alternative when using PHP 5.2, as shown in the example below. Example #2 DateTime.setTimestamp(3) alternative in PHP 5.2 <?php $ts = 1171502725; $date = new DateTime("@$ts"); echo $date->format('U = Y-m-d H:i:s') . " "; ?> The above example will output something similar to: 1171502725 = 2007-02-14 20:25:25 SEE ALSO
DateTime.getTimestamp(3). PHP Documentation Group DATETIME.SETTIMESTAMP(3)
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