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Why would ksh behave differently under Cygwin than under Solaris?
cygwin ksh is pdksh. The specific set of code you gave does not work in pdksh. Read about it here: http://web.cs.mun.ca/~michael/pdksh/
"Its weak points are that there are still a few differences from ksh88 (the major one is that `echo hi | read x' does not set x in the current shell - the read is done in a separate process). See the NOTES file in the distribution for more details."
You can get a Cygwin ksh from www.kornshell.com
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