How to copy a file into Linux back from the server (30ngs) using scp command

You should do scp usman@30ngs:/home/usman/training/bvd1.fa .

More generally, scp is like cp. Its first parameter is the source and the second parameter is the target. You can do either

scp local/path/to/file user@hostname:remote/path

or

scp user@hostname:remote/path/to/file local/path

By the way, the -r option does not stand for "reversed", it is "recursive".

- - , .