欢迎，来自IP地址为：18.119.107.161 的朋友
SCP命令意指“secure cp”，是采用SSH协议进行远程文件拷贝的命令。使用这条命令，可以很方便的向远程服务器拷贝文件或目录。
scp命令的基本用法如下所示：
scp source_file_name username@destination_host:destination_folder
其中 source_file_name 表示源文件或目录， username 表示远程主机的登录用户， @destination_host 是要登录的远程主机， destination_folder 表示远程主机的目标文件夹。
如果不带任何参数，那么scp会在后台运行，在命令执行完成或中途出现错误时才会向用户显示信息。加入“-v”参数后，就可以将后台信息显示给用户，以便用户进行命令执行跟踪和问题处理。典型输出如下所示：
Executing: program /usr/bin/ssh host www.daehub.com, user root, command scp -v -t /dataroot OpenSSH_7.4p1, OpenSSL 1.0.2k-fips 26 Jan 2017 debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 58: Applying options for * debug1: Connecting to www.daehub.com [123.206.60.79] port 22. debug1: Connection established. debug1: permanently_set_uid: 0/0 debug1: key_load_public: No such file or directory debug1: identity file /root/.ssh/id_rsa type -1 debug1: key_load_public: No such file or directory debug1: identity file /root/.ssh/id_rsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file /root/.ssh/id_dsa type -1 debug1: key_load_public: No such file or directory debug1: identity file /root/.ssh/id_dsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file /root/.ssh/id_ecdsa type -1 debug1: key_load_public: No such file or directory debug1: identity file /root/.ssh/id_ecdsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file /root/.ssh/id_ed25519 type -1 debug1: key_load_public: No such file or directory debug1: identity file /root/.ssh/id_ed25519-cert type -1 debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_7.4 debug1: Remote protocol version 2.0, remote software version OpenSSH_5.3 debug1: match: OpenSSH_5.3 pat OpenSSH_5* compat 0x0c000000 debug1: Authenticating to www.daehub.com:22 as 'root' debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: algorithm: diffie-hellman-group-exchange-sha256 debug1: kex: host key algorithm: ssh-rsa debug1: kex: server->client cipher: aes128-ctr MAC: umac-64@openssh.com compression: none debug1: kex: client->server cipher: aes128-ctr MAC: umac-64@openssh.com compression: none debug1: kex: diffie-hellman-group-exchange-sha256 need=16 dh_need=16 debug1: kex: diffie-hellman-group-exchange-sha256 need=16 dh_need=16 debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<3072<8192) sent debug1: got SSH2_MSG_KEX_DH_GEX_GROUP debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: got SSH2_MSG_KEX_DH_GEX_REPLY debug1: Server host key: ssh-rsa SHA256:ssa1mjZJCFthN2Eis7tt7rP7db01ESB4v7wJcu3JAKI debug1: Host 'www.daehub.com' is known and matches the RSA host key. debug1: Found key in /root/.ssh/known_hosts:1 debug1: rekey after 4294967296 blocks debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: rekey after 4294967296 blocks debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password debug1: Next authentication method: gssapi-keyex debug1: No valid Key exchange context debug1: Next authentication method: gssapi-with-mic debug1: Unspecified GSS failure. Minor code may provide more information No Kerberos credentials available (default cache: KEYRING:persistent:0) debug1: Unspecified GSS failure. Minor code may provide more information No Kerberos credentials available (default cache: KEYRING:persistent:0) debug1: Next authentication method: publickey debug1: Trying private key: /root/.ssh/id_rsa debug1: Trying private key: /root/.ssh/id_dsa debug1: Trying private key: /root/.ssh/id_ecdsa debug1: Trying private key: /root/.ssh/id_ed25519 debug1: Next authentication method: password root@www.daehub.com's password:
此时，正确输入登录远程主机的用户密码，就可以顺利完成拷贝。如果需要把整个目录的内容发送到远程主机，则需要“-r”参数指定本地目录。用法示例如下：
scp -r source_folder username@destination_host:destination_folder
这样，就可以很方便的将本地目录下的所有文件传送到远程主机。
当然，scp 命令还有其它参数，下面对其进行简要说明，但不再做命令示例。
-p 估算传送时间并计时
-P 连接主机的选定端口，而不是SSH所使用的22端口
-C 采用压缩方式传送文件
-c 采用非默认的加密算法
-l 限定传送占用带宽，以kbps为单位
-q 采用静默方式传送，即不会显示相关信息
以上就是scp命令的简要用法说明，有了这个神奇的工具，可以很方便的通过命令行传送文件。当然，scp还有其它特色用法，这里就不再赘述。
