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#
scp -
-bash:
scp: command not found
- 解决思路：在一台运行正常的centos系统上执行命令，查看scp所依赖的安装包：
- rpm -qf /usr/bin/scp
openssh-clients-4.3p2-41.el5（这个安装包根据自己系统可能使用不同） - 然后在centos6.0系统上使用yum安装这个包即可
- #yum -y install openssh-clients
- 现在就可以正常使用啦。。。
- scp
usage: scp [-1246BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]
[-l limit] [-o ssh_option] [-P port] [-S program]
[[user@]host1:]file1 ... [[user@]host2:]file2 今天发现一个奇怪的问题： 用 scp 向 server 传文件的时， 在输入密码之后， scp 提示：找不到 scp， 如下：
yyc@localhost ~/private/share $ scp Makefile admin@x.x.x.x:/admin/test admin@x.x.x.x's password: (Input my password here) bash: scp: command not found lost connection
google 了一下，发现没有太合适的答案：多数都是 $PATH 的设置问题。 可是我这里明显不是这个问题：如果也是环境变量引起来的话，就会在输完 scp 命令并回车之后给出提示， 而不是等到输入了密码之后才给出提示。
后来用 -V 选项看了一下该命令的执行情况：
yc@ITC-208024 ~/private/share $ scp -v Makefile admin@x.x.x.x:/ts Executing: program /usr/bin/ssh host x.x.x.x, user admin, command scp -v -t -- /ts OpenSSH_5.8p1-hpn13v10, OpenSSL 1.0.0d 8 Feb 2011 debug1: Reading configuration data /etc/ssh/ssh_config debug1: Connecting to x.x.x.x [x.x.x.x] port 22. debug1: Connection established. debug1: identity file /home/yyc/.ssh/id_rsa type -1 debug1: identity file /home/yyc/.ssh/id_rsa-cert type -1 debug1: identity file /home/yyc/.ssh/id_dsa type -1 debug1: identity file /home/yyc/.ssh/id_dsa-cert type -1 debug1: identity file /home/yyc/.ssh/id_ecdsa type -1 debug1: identity file /home/yyc/.ssh/id_ecdsa-cert type -1 debug1: Remote protocol version 1.99, remote software version OpenSSH_4.3 debug1: match: OpenSSH_4.3 pat OpenSSH_4* debug1: Remote is NON-HPN aware debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.8p1-hpn13v10 debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: AUTH STATE IS 0 debug1: REQUESTED ENC.NAME is 'aes128-ctr' debug1: kex: server->client aes128-ctr hmac-md5 none debug1: REQUESTED ENC.NAME is 'aes128-ctr' debug1: kex: client->server aes128-ctr hmac-md5 none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug1: Server host key: RSA a9:29:40:1d:c8:15:f7:e2:de:f6:83:6d:a1:2b:40:30 debug1: Host 'x.x.x.x' is known and matches the RSA host key. debug1: Found key in /home/yyc/.ssh/known_hosts:5 debug1: ssh_rsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: Roaming not allowed by server debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey,gssapi-with-mic,password debug1: Next authentication method: publickey debug1: Trying private key: /home/yyc/.ssh/id_rsa debug1: read PEM private key done: type RSA debug1: Authentications that can continue: publickey,gssapi-with-mic,password debug1: Trying private key: /home/yyc/.ssh/id_dsa debug1: Trying private key: /home/yyc/.ssh/id_ecdsa debug1: Next authentication method: password admin@x.x.x.x's password: debug1: Authentication succeeded (password). Authenticated to x.x.x.x ([x.x.x.x]:22). debug1: HPN to Non-HPN Connection debug1: Final hpn_buffer_size = 2097152 debug1: HPN Disabled: 0, HPN Buffer Size: 2097152 debug1: channel 0: new [client-session] debug1: Enabled Dynamic Window Scaling debug1: Entering interactive session. debug1: Sending command: scp -v -t -- /ts debug1: client_input_channel_req: channel 0 rtype exit-status reply 0 bash: scp: command not found debug1: channel 0: free: client-session, nchannels 1 debug1: fd 0 clearing O_NONBLOCK debug1: fd 1 clearing O_NONBLOCK Transferred: sent 2320, received 1720 bytes, in 0.0 seconds Bytes per second: sent 55644.9, received 41254.0 debug1: Exit status 127 lost connection
从上面可以看出，本地的 scp 已经成功的和 server 建立了连接，进行了认证， 并且向 Server 发送了一个命令： scp -v -t –/ts。 而就在这之后，发现了前面看到的那个提示： "Command not found"。
这时才想起来， server 端是一个定制的服务器，上面应该没有 scp 程序，也就是说： 是 Server 没有找到 scp ， 而不是本地。
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