FTP :

I am new to UNIX. Last week when I was downloading jar files from server to local hard disk, some files are corrupted in my server.
I used normal FTP command like mget and mput …
But I didn’t set Binary Mode.

what would be happened in server?

Give any solution, pls

nothing happened in the server - it did exactly what you asked it to.

If you didn't set binary mode, you would have transferred all the files as ASCII. jar files are not ASCII files, and they have therefore been corrupted.

You need to re-transfer them as binary.