Is there Difference

[rachelle]

I am curious to know whether the file size a user uploads and downloads would be same before and after the ftp process in an UNIX operating system. That is to say whether a file say sample text file would be same in bytes before uploading in ftp and even after downloading using ftp in an UNIX operating system. Is not why the difference occurs.

[sammy]

You can very well check the size of bytes using the command as
cksum filename1 filename2
If you are particular about size of bytes before and after transferring I would suggest that if you transfer your required files in binary format then there would not be any difference in size before and after transfer. If not carry on with your current transfer method itself. There would not be any loss of data. The difference would be only because of some terminator getting added.