ssh, security, ubuntu, sftp | サーバーの環境 $ cat /etc/issue Ubuntu 12.04.1 LTS \n \l $ sshd -v sshd: illegal option -- v OpenSSH_5.9p1 Debian-5ubuntu1, OpenSSL 1.0.1 14 Mar 2012 usage: sshd [-46DdeiqTt] [-b bits] [-C connection_spec] [-c host_cert_file] [-f config_file] [-g login_grace_time] [-h host_key_file] [-k key_gen_time] [-o option] [-p port] [-u len] $ まずSFTP用専用のユーザを作成します $ sudo useradd sftp-u