post_check /bin/zipscript [path mask]
	post_check runs AFTER an upload finishes

	post_check can be defined multiple times. Path mask is optional; if
	present, glftpd will only execute this script if the path mask matches
	the full path to where the file was uploaded. If the path doesn't
	match, glftpd will try to find another post_check declaration whose
	path does match, or one that doesn't have a path mask.

	Example:
	post_check none /site/public/*  # disables zipscript in /site/public
	post_check /bin/special.sh /site/special/*      # special zipscript
	post_check /bin/zipscript *     # normal zipscript for all other paths

	If you want to enable upload resume in a certain path, you should
	disable the zipscript for that path, so that partial files are not
	deleted when the uploader loses connection.

	The post_check script receives 3 parameters from glftpd:
	$1 - the name of file uploaded
	$2 - the directory the file was uploaded to
	$3 - the CRC code of that file (if calc_crc was enabled, or 000000 otherwise)
	     NOTE: If the uploader times out the CRC code will also be 000000, this to
	           prevent that if one reconnected and started uploading the same file
	           again but left an stalled upload session alive a bad crc would be passed,
	           and the file would get deleted.

	If zipscript exits with 1 or 127, glftpd assumes there was a problem executing
	it. The file will not be deleted or unduped.
	If zipscript exits with anything bigger than 1, glftpd will assume that the
	file uploaded was bad and it will be deleted, the user's credits and stats will
	not be added, and the file will be removed from the dupe database.

	If zipscript exits with a number between 10 and 1010, glftpd will "sleep" for that
	many seconds minus 10 before continuing.  This might be helpful if you want to
	prevent people from uploading a file that is being uploaded to their system over
	and over until it is complete.
	ex. To make a user wait 10 seconds after uploading a bad file, exit with 20.
	NOTE: exit code 127 is exempted: it will NOT cause a delay, it will be
	treated like exit code 1 instead.