pgsql archive command notes

This is a critique of documented "archive_command" usage in pgsql.  There is an example which says:

  archive_command = 'test ! -f /destination/%f && cp %p /destination/%f"

I wouldnt use this.  The problem is if the disk is full, I tested cp to produce short files (partial files).  Even if it does exit with a nonzero exit code, the next copy attempt will be seen as a success ("test ! -f __" is false since the file is already there). 
What I would do is use rsync.  In its default setting, it does not create short files:

  archive_command = 'test ! -f /destination/%f && rsync %p /destination/%f"

ep