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Windows

On first execution, these binaries will get placed in the following directory (on a per user basis): 

%USERPROFILE%\rsync4j

Below that directory there are home/%USERNAME%/.ssh and bin.

ssh vs plain protocol#

By default, plain protocol is used. If you want to use ssh, then simply supply this via the dummy string ssh. In Java code, this is done via rsh("ssh"). On the command-line, via --rsh=ssh.

SSH keys#

You can place your ssh key pairs in the following directory:

%USERPROFILE%\rsync4j\home\%USERNAME%\.ssh

Binaries (64-bit)#

rsync4j uses the rsync.exe, ssh.exe and ssh-keygen.exe executables and their dependencies from the 64-bit version of cywgin.

The dependencies, as of 2026-04-22 (OpenSSH 10.3p1-1), are as follows:

  • cygcom_err-2.dll
  • cygcrypto-3.dll
  • cyggcc_s-seh-1.dll
  • cyggssapi_krb5-2.dll
  • cygiconv-2.dll
  • cygintl-8.dll
  • cygk5crypto-3.dll
  • cygkrb5-3.dll
  • cygkrb5support-0.dll
  • cyglz4-1.dll
  • cygwin1.dll
  • cygxxhash-0.dll
  • cygz.dll
  • cygzstd-1.dll

You can easily determine the dependencies by running the executables. Windows will automatically pop up a dialog mentioning any DLLs that are missing. Place any missing DLLs in the following directory:

rsync4j-windows64/src/main/resources/com/github/fracpete/rsync4j/windows64

And list the DLLs in the following text file:

rsync4j-windows64/src/main/resources/com/github/fracpete/rsync4j/windows64/libraries.txt

Paths#

Since cygwin is being used, local paths get converted to cywgin notation.

For example: 

C:\some\path\blah.txt
Will get automatically get converted to: 
/cygdrive/c/some/path/blah.txt

Syncing between Windows hosts#

You can easily synchronize two Windows hosts by using a UNC path for the remote host. For instance, directory C:\some\dir on the local machine can be synced to remotehost otherbox into directory C:\other\dir using these paths:

  • source: /cygdrive/c/some/dir/
  • destination: //otherbox/C$/other/dir

Custom location#

See Environment variables/Windows.