hello,

parameter expansion with an expression containing escaped quotes behaves incorrectly inside here-documents, here a simple test:

  $ printf 'cat <<EOF\n${UNSET:-\\"test\\"}\nEOF\n' | bash
  \"test\"

where it works fine on ksh, dash, busybox, mksh:

  $ printf 'cat <<EOF\n${UNSET:-\\"test\\"}\nEOF\n' | ksh
  "test"

with bash it works fine outside here-documents:

  $ printf 'echo ${UNSET:-\\"test\\"}\n' | bash
  "test"

i found that bug developing http://www.trek.eu.org/devel/sysd2v

ciao!