autossh用法整理

首先，我们从autossh的manpage来看下：

NAMEautossh — monitor and restart ssh sessions
SYNOPSISautossh [-V] [-M port[:echo_port]] [-f] [SSH_OPTIONS]
DESCRIPTIONautossh is a program to start a copy of ssh and monitor it, restarting it as necessary should it die or stop passing traffic.

从这几句简单清楚的描述，我们知道autossh本身就是个管理、维护ssh的命令，所以其参数也只有最基本的-V(version)、-M(monitoring)、-f(background)。而我们常说的端口转发，反向代理等厉害的功能其实是ssh实现的，我们把参数传给autossh，然后autossh传给ssh来实现特定的功能。

接着，我们看下ssh的manpage:

NAMEssh — OpenSSH SSH client (remote login program)SYNOPSISssh [-1246AaCfGgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec] [-D [bind_address:]port][-E log_file] [-e escape_char] [-F configfile] [-I pkcs11] [-i identity_file] [-L address][-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port] [-Q query_option] [-R address][-S ctl_path] [-W host:port] [-w local_tun[:remote_tun]] [user@]hostname [command]DESCRIPTIONssh (SSH client) is a program for logging into a remote machine and for executing commands on a remotemachine.  It is intended to provide secure encrypted communications between two untrusted hosts over aninsecure network.  X11 connections, arbitrary TCP ports and UNIX-domain sockets can al

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