我要评论环境：rhel6.5
使用scp命令报错：
[root@oradb23 media]# scp /etc/hosts oradb24:/etc/ -bash: scp: command not found
查看openssh相关包：
[root@oradb23 ~]# rpm -qa openssh* openssh-5.3p1-94.el6.x86_64 openssh-server-5.3p1-94.el6.x86_64
发现服务器默认没有安装openssh的客户端。
yum 安装openssh客户端
[root@oradb23 ~]# yum install openssh-clients [root@oradb23 ~]# rpm -qa openssh* openssh-clients-5.3p1-94.el6.x86_64 openssh-5.3p1-94.el6.x86_64 openssh-server-5.3p1-94.el6.x86_64
yum配置本地源可参考：
1.创建挂载目录
# mkdir -p /media/cdrom
2.挂载对应系统版本的iso光盘镜像文件
# mount -o loop -t iso9660 /opt/rhel-server-6.2-x86_64-dvd.iso /media/cdrom
3.配置yum文件如下
# vi /etc/yum.repos.d/rhel-source.repo
[iso] name=iso baseurl=file:///media/cdrom/server/ enabled=1 gpgcheck=0
验证scp命令可用
[root@oradb23 ~]# 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
再次执行：
[root@oradb23 ~]# scp /etc/hosts oradb24:/etc/ the authenticity of host 'oradb24 (192.168.1.24)' can't be established. rsa key fingerprint is e0:fb:fb:67:a0:fc:cd:a5:dc:c8:bc:68:67:b1:93:3f. are you sure you want to continue connecting (yes/no)? yes warning: permanently added 'oradb24,192.168.1.24' (rsa) to the list of known hosts. root@oradb24's password: bash: scp: command not found lost connection
说明oradb24主机同样没有安装openssh客户端，
在oradb24主机也同样yum 安装,确定scp可用
[root@oradb24 ~]# yum install openssh-clients
[root@oradb24 ~]# 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
再次尝试scp拷贝，这次就可以正常拷贝了。
[root@oradb23 ~]# scp /etc/hosts oradb24:/etc/ root@oradb24's password: hosts 100% 380 0.4kb/s 00:00
说明scp拷贝，两端都需要保证scp命令可用才可以。
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