Session Initiation
The client initiates SSH or RSH connection with echo FISH:;/bin/sh as the command executed on remote machine. This should make it possible for the server to distinguish FISH connections from normal RSH or SSH.
The first two commands sent to the server are FISH and VER to negotiate FISH protocol, its version and extensions.
#FISH echo; start_fish_server; echo '### 200' #VER 0.0.2The server may reply to VER command with a lines like
VER 0.0.0which indicates supported version of the FISH protocol and supported extensions.
Read more about this topic: Files Transferred Over Shell Protocol
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