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Automatically downloading updates


Staff member
Migrated From JP Software Wiki

Please note that current versions of JP Software products all have update built into the programs so this is not needed, but it does provide a useful technique.


This batch synchronizes a download directory with the jpsoft ftp site.

It is equivalent to

1. rmdir /s mymirror
2. copy /su ftp mymirror

Only doing a copy will not remove the files or directories deleted on the ftp.

  • Copy the batch the name is not significant.
  • Change the location of the local directory in the batch file: variable localMirror.
  • Run the batch no parameters needed.


Copy all the updated files from the ftp site.

Write a list of the files in the local directory into a file removing the directory information

Append the name of all the files at the ftp site to this list removing the ftp directory information and changing the / into \.

This should make the local names and the ftp names identical.

Sort the list.

Read the list line by line:
  • Duplicate names implies that the file in the local directory is up to date.
  • If a name occurs only once then either the file or directory was deleted from the ftp or the transfer has failed.
  • If a file or a directory exists locally, delete it, otherwise the update must have failed, post a message and continue.
:: 4update.btm
:: mirror jpsoft ftp download directory
:: ---------------------------------------------------------------- ::
:: set the variable localMirror to the name of your local directory ::
:: ---------------------------------------------------------------- ::
@echo off

:: name of your mirror directory
set localMirror=C:\Download\jpsoft\ftp\

:: -- this line allows editor colorizer to work for a global
:! tmp temp

:::  set variables
::!  curr:			filename in mirror
::!  f1:			unique temp file
::!  f2:			unique temp file
::!  fn:			unique temp file used to normalize mirror path name
::!  ftp:			file name on the ftp
::!  line:			filename in the list
::!  localmirror:	mirror directory name
::!  prev:			file name in the list
::!  t:				path for temp or tmp directory
::!  temp: 			global
::!  tmp:  			global

set ftp=jpsoft.com

:: Normalize directory
if not direxist %localMirror mkdir %localMirror
set fn=%@unique[%localMirror]
set localMirror=%@path[%fn]
del /q %fn

:: Create a permanent connection
iftp /N ftp://anonymous:pwd@%ftp

:: copy all the files newer then the current files (including empty directories)
copy /fzsgu "ftp:*.*" %localMirror
set t=%tmp
if (%t) == () set t=%temp
set f1=%@unique[%t]
:: list all the files in the backup without the directory information
pdir /s /(@right[-%@len[%localMirror],*]) %localMirror > %f1
:: append all the files in the ftp without the directory information
:: replace / with \
:: all the file names in both set should be identical
pdir /s /(@replace[/,\,%%@right[-4,*]]) "ftp:*.*" >> %f1

set f2=%@unique[%t]
:: order so that duplicate names follow each other
sort %f1 > %f2

:: append a dummy end of file simplify testing the last file
echo + >> %f2

set prev=

do line in @%f2
	iff "%prev" == ""  then
		:: eof when expecting a new name we are done
		if "%line" == "+" leave
		iff "%line" == "%prev" then
			set line=
			set curr=%@quote[%localMirror%%prev]
			set ftp=ftp:/%@replace[\,/,%prev]
			iff exist %curr .and. exist %ftp then
				:: Once in a while pdir seems to miss files
				:: maybe others are accessing them
				echo %prev not properly reported by pdir
			elseiff direxist %curr then 
				:: directory removed from the ftp site
				rmdir /sq %curr
				echo remove dir %curr
			elseiff exist %curr then
				:: file removed from the ftp site
				del /q %curr
				echo delete file %curr
				:: should have transferred this file 
				iff isdir %ftp .and. %@files[%ftp,-d] == 0 then
					:: empty directories are not transferred
					mkdir %curr
					echo %curr not received
	set prev=%line

iftp /c

:: clean up
del /q %f1 %f2