有很多教程可以直接使用SSH密钥副本，但不会检查密钥是否已经远程存在。 这应该工作：
cat ~/.ssh/id_rsa.pub | ssh -p <port> <user>@<hostname> 'sh -c "if ( ! grep -q '`cat -`' ~/.ssh/authorized_keys); then cat - >>~/.ssh/authorized_keys; fi"' 在grep里面的cat -不会被内插到一个单一的string中，而是3，并且抛出所有的东西。 我在Ruby中做了这个工作，但它并不理想。 任何bash赞成周围？
Net::SSH.start(<host>, <username>, :password => <password>, :port => <port>) do |ssh| local_public_key = `cat ~/.ssh/id_rsa.pub`.chomp ssh.exec! %{ if ( ! grep -q '#{local_public_key}' ~/.ssh/authorized_keys ); then echo '#{local_public_key}' >> ~/.ssh/authorized_keys; fi }
只需使用一个variables，如下所示：
KEY=$(cat ~/.ssh/id_rsa.pub) ssh -p <port> <user>@<hostname> "if [ -z \"\$(grep \"$KEY\" ~/.ssh/authorized_keys )\" ]; then echo $KEY >> ~/.ssh/authorized_keys; echo key added.; fi;"
为什么不使用ssh-copy-id ？
名称
ssh-copy-id -- copy public keys to a remote host概要
ssh-copy-id [-lv] [-i keyfile] [-o option] [-p port] [user@]hostname描述
The ssh-copy-id utility copies public keys to a remote host's ~/.ssh/authorized_keys file (creating the file and directory, if required). The following options are available: -i file Copy the public key contained in file. This option can be speci- fied multiple times and can be combined with the -l option. If a private key is specified and a public key is found then the pub- lic key will be used. -l Copy the keys currently held by ssh-agent(1). This is the default if the -i option was not specified. -o ssh-option Pass this option directly to ssh(1). This option can be speci- fied multiple times. -p port Connect to the specified port on the remote host instead of the default. -v Pass -v to ssh(1). The remaining arguments are a list of remote hosts to connect to, each one optionally qualified by a user name.退出状态
The ssh-copy-id utility exits 0 on success, and >0 if an error occurs.例子
To send a specific key to multiple hosts: $ ssh-copy-id -i /path/to/keyfile.pub user@host1 user@host2 user@host3