为什么命令没有在bash中使用管道获取输入？-Whyisthecommandnotgettngtheinputwithpipeinbash?

I am trying to do something simple in bash but I cannot get it to work. I have defined the variable:

我试图在bash中做一些简单的事情,但我无法让它工作。我已定义变量:

 export devcluster2="10.122.22.22"

in my .bashrc. When I type:

在我的.bashrc中。当我输入:

echo $devcluster2 I get as expected:

echo $ devcluster2我按预期得到:

10.122.22.22

now I want to do:

现在我想做:

echo '$devcluster2' | ssh

but I get

但我明白了

usage: ssh [-1246AaCfgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]
       [-D [bind_address:]port] [-e escape_char] [-F configfile]
       [-I pkcs11] [-i identity_file]
       [-L [bind_address:]port:host:hostport]
       [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]
       [-R [bind_address:]port:host:hostport] [-S ctl_path]
       [-W host:port] [-w local_tun[:remote_tun]]
       [user@]hostname [command]

I want to understand why the ssh doesn't get the output of echo as an input? and how can I get it to work?

我想了解为什么ssh没有将echo的输出作为输入?我怎样才能让它发挥作用?

1 个解决方案

ssh 10.122.22.22

ssh "$devcluster2"

$ ssh
usage: ssh [-1246AaCfgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]
           [-D [bind_address:]port] [-E log_file] [-e escape_char]
           [-F configfile] [-I pkcs11] [-i identity_file]
...