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Top Forums UNIX for Dummies Questions & Answers Run a cronjob only when a file is modified? Post 302598875 by Corona688 on Wednesday 15th of February 2012 03:31:16 PM
Old 02-15-2012
Instead of worrying about calculating 'a week ago', let cron do that work. Just keep a temp file that you touch whenever you update the data. If the input datafile is newer than your tempfile -- or the tempfile doesn't exist -- you should update.

Code:
00 1 * * 5 [ /tmp/.lastupdate -nt /my_dir_name/my_Filename ] || ( myScript > myLogFile ; touch /tmp/.lastupdate )

 

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TMPFILE(3)								 1								TMPFILE(3)

tmpfile - Creates a temporary file

SYNOPSIS
resource tmpfile (void ) DESCRIPTION
Creates a temporary file with a unique name in read-write (w+) mode and returns a file handle . The file is automatically removed when closed (for example, by calling fclose(3), or when there are no remaining references to the file handle returned by tmpfile(3)), or when the script ends. For details, consult your system documentation on the tmpfile(3) function, as well as the stdio.h header file. RETURN VALUES
Returns a file handle, similar to the one returned by fopen(3), for the new file or FALSE on failure. EXAMPLES
Example #1 tmpfile(3) example <?php $temp = tmpfile(); fwrite($temp, "writing to tempfile"); fseek($temp, 0); echo fread($temp, 1024); fclose($temp); // this removes the file ?> The above example will output: writing to tempfile SEE ALSO
tempnam(3), sys_get_temp_dir(3). PHP Documentation Group TMPFILE(3)
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