SFTP server

#log in
sftp leo@82.992.123.124

#after log in

# upload a file:
put test.txt

# download a file
get test.txt

# delete a file
rm test.txt

Directly copy file between the server and the local machine if can ssh to the server

# find server public ip: 100.31.47.111

# ssh to the server
ssh -i /Users/leo/path/noc.pem ec2-user@100.31.47.111

# copy file to server
scp -i /Users/leo/path/noc.pem /Users/leo/path/test.txt.gpg  ec2-user@100.31.47.111:/home/ec2-user/

# copy file from server to local
scp -i /Users/leo/path/noc.pem  ec2-user@100.31.47.111:/home/ec2-user/test.txt  /Users/leo/path/ 

Decrypt gpg file

# verify have the private key
gpg --list-secret-keys

# decrypt. when prompt, provide private key phrase
gpg --decrypt --output mytest.csv  mytest.csv.gpg