*** This bug is a duplicate of bug 259671 ***
    https://bugs.launchpad.net/bugs/259671

The backslash escape sequences are being processed by "echo", not
"read". You can avoid this inconsistency by doing something like

printf "%s\n" '000\n999' | dash -c ' read -r f ; printf "%s\n" "$f" '

** This bug has been marked a duplicate of bug 259671
   dash: echo builtin interprets backslash escape sequences

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https://bugs.launchpad.net/bugs/880120

Title:
  read -r does not protect backslashes

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