bash script + heredoc + tftp = bash ends unexpectedly

[Gary]

I am trying to automate a task I need to do which uses tftp.

What I effectively have (simplest possible case which shows the error)
is:
,----
| #! /bin/sh
| 
| echo "hmmmm..."
| tftp <<END
| quit
| END
| echo "DONE!"
`----

The result of which is that I briefly see "hmmmm..." before the script,
terminal (mintty), and bash processes all simply vanish. Now, even if my
script is wrong, that seems... just mean.

GNU bash, version 3.2.51(24)-release (i686-pc-cygwin)
mintty 0.8.3


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