This might be a repeat question but exact explanation I am not getting. I am new to LINUX environment.
I was trying to copy files from one system to other system. If I issue rcp command it copies without asking for password but if I issue rsync command then it asking for permission. Can you please explain why?
rcp is an ancient and insecure program for copying files between remote machines. Avoid it. scp (of the ssh suite) is the secure, modern alternative.
rsync is a relatively recent program. When connecting remotely, it uses ssh in the background which, being secure, is what is asking for credentials.