在linux安裝部署或者升級分布式系統時，經常要重當前主機拷貝文件到集群中其他的主機節點，或者從其他主機節點拷貝文件到當前主機。

我們知道cp命令是同一主機下面文件的拷貝，而scp命令就是linux下實現遠程主機之間文件拷貝的命令，支持向遠程主機‘推文件’和向遠程主機‘拉文件’的方式。

輸入scp -h看看選項：

$ scp -h unknown option -- h usage: scp [-12346BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file][-l limit] [-o ssh_option] [-P port] [-S program][[user@]host1:]file1 ... [[user@]host2:]file2
列出了一些選項和大致的用法，不過具體選項是什么意思并不知道。

輸入man scp看看說明：

SCP(1) BSD General Commands Manual SCP(1)NAMEscp — secure copy (remote file copy program)SYNOPSISscp [-12346BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file] [-l limit] [-o ssh_option] [-P port] [-S program] [[user@]host1:]file1 ... [[user@]host2:]file2DESCRIPTIONscp copies files between hosts on a network. It uses ssh(1) for data transfer, and uses the same authentication and provides the same security as ssh(1). scp will ask for passwords orpassphrases if they are needed for authentication.File names may contain a user and host specification to indicate that the file is to be copied to/from that host. Local file names can be made explicit using absolute or relative pathnamesto avoid scp treating file names containing ‘:’ as host specifiers. Copies between two remote hosts are also permitted.The options are as follows:-1 Forces scp to use protocol 1.-2 Forces scp to use protocol 2.-3 Copies between two remote hosts are transferred through the local host. Without this option the data is copied directly between the two remote hosts. Note that this option dis‐ables the progress meter.-4 Forces scp to use IPv4 addresses only.-6 Forces scp to use IPv6 addresses only.-B Selects batch mode (prevents asking for passwords or passphrases).-C Compression enable. Passes the -C flag to ssh(1) to enable compression.-c cipherSelects the cipher to use for encrypting the data transfer. This option is directly passed to ssh(1).-F ssh_configSpecifies an alternative per-user configuration file for ssh. This option is directly passed to ssh(1).-i identity_fileSelects the file from which the identity (private key) for public key authentication is read. This option is directly passed to ssh(1).-l limitLimits the used bandwidth, specified in Kbit/s.-o ssh_optionCan be used to pass options to ssh in the format used in ssh_config(5). This is useful for specifying options for which there is no separate scp command-line flag. For fulldetails of the options listed below, and their possible values, see ssh_config(5).AddressFamilyBatchModeBindAddressCanonicalDomainsCanonicalizeFallbackLocalCanonicalizeHostnameCanonicalizeMaxDotsCanonicalizePermittedCNAMEsCertificateFileChallengeResponseAuthenticationCheckHostIPCipherCiphersCompressionCompressionLevelConnectionAttemptsConnectTimeoutControlMasterControlPathControlPersistGlobalKnownHostsFileGSSAPIAuthenticationGSSAPIDelegateCredentialsHashKnownHostsHostHostbasedAuthenticationHostbasedKeyTypesHostKeyAlgorithmsHostKeyAliasHostNameIdentityFileIdentitiesOnlyIPQoSKbdInteractiveAuthenticationKbdInteractiveDevicesKexAlgorithmsLogLevelMACsNoHostAuthenticationForLocalhostNumberOfPasswordPromptsPasswordAuthenticationPKCS11ProviderPortPreferredAuthenticationsProtocolProxyCommandPubkeyAcceptedKeyTypesPubkeyAuthenticationRekeyLimitRhostsRSAAuthenticationRSAAuthenticationSendEnvServerAliveIntervalServerAliveCountMaxStrictHostKeyCheckingTCPKeepAliveUpdateHostKeysUsePrivilegedPortUserUserKnownHostsFileVerifyHostKeyDNS-P portSpecifies the port to connect to on the remote host. Note that this option is written with a capital ‘P’, because -p is already reserved for preserving the times and modes of thefile.-p Preserves modification times, access times, and modes from the original file.-q Quiet mode: disables the progress meter as well as warning and diagnostic messages from ssh(1).-r Recursively copy entire directories. Note that scp follows symbolic links encountered in the tree traversal.-S programName of program to use for the encrypted connection. The program must understand ssh(1) options.-v Verbose mode. Causes scp and ssh(1) to print debugging messages about their progress. This is helpful in debugging connection, authentication, and configuration problems.EXIT STATUSThe scp utility exits 0 on success, and >0 if an error occurs.SEE ALSOsftp(1), ssh(1), ssh-add(1), ssh-agent(1), ssh-keygen(1), ssh_config(5), sshd(8)HISTORYscp is based on the rcp program in BSD source code from the Regents of the University of California.AUTHORSTimo Rinne <tri@iki.fi>Tatu Ylonen <ylo@cs.hut.fi>BSD September 25, 2015 BSD

里面常用的選項有，-r 拷貝目錄，-v 顯示拷貝時的調試信息，對于拷貝文件出錯有幫助，-l 限制拷貝時帶寬等。

總結

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