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zero-master/gist:9921261

Created April 1, 2014 19:27
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Check if SSH Tunnel Started Successfully!
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gistfile1
Use netcat -- often nc on Linux systems:
nc -dvzw10 ${HOSTNAME} 23
Works for me, with a response like:
Connection to ${HOSTNAME} 23 port [tcp/telnet] succeeded!
It also returns 0 on success, and is happy with a simple connection after which it goes away.
-d means not to read anything from the keyboard side
-v means to be verbose (turn this off in a script)
-z means to disconnect after making the connection
-w10 means to wait up to 10 seconds, otherwise give up
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