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[ale] ssh remote command

What would cause an ssh tunneled command to no return when it finished?

ssh -f remotemachine /usr/local/mynewcommand.sh

mynewcommand.sh is a shell script that runs the ssh port tunnel followed
by the nc command to transport serial port over to ssh forwarded port.
It ends with 

exit 0

What I see is the initial ssh never finishes and just sits there. I
thought once the command ran, it should terminate and the ssh closes. It
doesn't. puzzled. 

 I stuck in some echo"" statement so I can see what is happening and
everything runs OK on the remote machine. 
James P. Kinney III          \Changing the mobile computing world/
CEO & Director of Engineering \          one Linux user         /
Local Net Solutions,LLC        \           at a time.          /
770-493-8244                    \.___________________________./

GPG ID: 829C6CA7 James P. Kinney III (M.S. Physics)
<jkinney at localnetsolutions.com>
Fingerprint = 3C9E 6366 54FC A3FE BA4D 0659 6190 ADC3 829C 6CA7
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