sunique - Store remote files uniquely

The sunique command controls the handling of files being stored on the remote host, i.e. when working with put, mput or send. The sunique command toggles the current setting on or off and the defined setting remains in effect until sunique is called again.

On starting FTP, sunique is disabled by default.

sunique disabled:

If there is already an existing file of the same name, it is overwritten, provided the appropriate write authorization exists.

sunique enabled:

If the file to be transferred already exists, it is recreated using a unique name.  If the partner is a BS2000 FTP server the unique name is created by appending a suffix (.1 to .99). If the suffixes from .1 to .99 have already been used, an error message is issued and the transfer is aborted. Other FTP servers may have other conventions for creating the unique name, see documentation of the respective FTP server.

sunique