How to run a local script in a remote server?

<p>I want a way to replicate this command using ssh/crypto:</p> <blockquote> <p>ssh user@host /bin/bash &lt; dummy.sh</p> </blockquote> <p>I can easily run binaries that&#39;s already in the host with simple</p> <blockquote> <p>session.Run(cmd)</p> </blockquote> <p>But I am having issues running complex command like this.</p> <hr/>**评论：**<br/><br/>Perhyte: <pre><p>As <a href="/u/JHunz" rel="nofollow">/u/JHunz</a> said, the <code>&lt;</code> is not really part of the command line sent to the other machine. It just tells the <em>local</em> shell to connect <code>dummy.sh</code> to the stdin of the <code>ssh</code> command (which is why it only works if the file is locally available). It&#39;s pretty much exactly as if you typed the contents of that file into ssh, then pressed Ctrl+D to simulate EOF and close the command.</p> <p>Now, as for how to replicate this in Go: the interface for <code>crypto/ssh.Session</code> seems to be similar to that of <code>os/Exec.Cmd</code>, so my guess would be something like:</p> <pre><code>file, err := os.Open(&#34;dummy.sh&#34;) if err != null { return err; } defer file.Close() session.Stdin = file session.Run(cmd) </code></pre> <p>Disclaimer: I&#39;ve never had occasion to use the <code>crypto/ssh</code> package.</p></pre>titpetric: <pre><p>The cmd here should be something like &#34;bash -c&#34; for crypto/ssh, or &#34;ssh user@host bash -c&#34; for using os/exec, as a slice ofc. +1 on the explanation.</p> <p>It&#39;s also possible to copy the originating script to the remote machine by running <code>cat &gt; /tmp/outfile.sh</code> as the cmd. The file will be sent to Stdin, cat which executes on the remote host will read from it, and then write the contents into a file on the system. It might be better do so it like this, just so there&#39;s no weird tty issues or whatever (I haven&#39;t hit them myself, but some things require a tty and break if you don&#39;t have one).</p></pre>JHunz: <pre><p>The reading of the file and passing it in via the &lt; is part of the shell, not SSH, so it&#39;s no wonder you&#39;re having trouble replicating it using just the SSH package. I&#39;m guessing the best approach is to read the whole script in, then pass it all as the cmd to Session.Run</p></pre>pzduniak: <pre><p>You should execute it in sh -c - otherwise you&#39;d pollute the system with temporary scripts.</p></pre>janderssen: <pre><p>Ignoring best practises (ie error handling), the basic way I do this in our server is as follows :</p> <pre><code>signer, err := ssh.ParsePrivateKey([]byte(connectionInfo.PrivateKey)) sshConfig := &amp;ssh.ClientConfig{ User: connectionInfo.UserID, Auth: []ssh.AuthMethod{ ssh.PublicKeys(signer), }, Timeout: time.Second * 5, } conn, err := net.DialTimeout(&#34;tcp&#34;, connectionInfo.AddressString(), sshConfig.Timeout) .. c, chans, reqs, err := ssh.NewClientConn(conn, connectionInfo.AddressString(), sshConfig) .. client = ssh.NewClient(c, chans, reqs) </code></pre> <p>So to run a command </p> <pre><code>session, err := client.NewSession() var b bytes.Buffer session.Stdout = &amp;b session.Run(&#34;ls -l&#34;) // or what ever you want to execute </code></pre> <p>b contains output</p> <p>Copy a script to the server for execution:</p> <pre><code>session, err := client.NewSession() bytesReader := bytes.NewReader(bytesToWrite) scp.Copy(int64(len(bytesToWrite)), 0644, filename, bytesReader, path, session) </code></pre> <p>I hope this helps.</p></pre>notacyborg-v0: <pre><p>Thanks, I have been trying to avoid doing that but looks like this is the only way out. Let me try it.</p></pre>