question about ssh and telnet

ok if i create a user on redhat 7.3

and put that user in the group users

will they be able to login via ssh or telnet???

because i just want the users to be able to upload using ftp

thanx

actually, also, what exactly is ssh??? is it to allow people to use the command line of the server from a remote location???

as i dont want to be able to access the commandline away from the server so can i turn it off????

thanx

 

 

 

 

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