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1) pkksh in sh mode closed fd's other than [012] on exec'ing a command.
this is a ksh'ism and POSIX sates that open files are part of the
environment to be passed to the new process.
2) pdksh in sh mode interpets (( as meaning the start of arithmetic
"quoting", which is incompatible with it's usage as a nested
sub-shell invocation. The $(( form for arithmetic substitution
is stil valid, however.
PR user/59 millert@openbsd.org (Todd C. Miller)
3) pdksh sh.1 manpage isn't explicit about the range of input text
that is subject to field splitting after a substitution.
PR user/236 Mathieu.Herrb@mipnet.fr (Mathiew Herrb)
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