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Problem Report 0768 Details

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This page provides all information on Problem Report 0768.

Report 0768 Actions

    Problem Report Number 0768
    Submitter's Classification Specification problem
    State Resolved
    Resolution Temporary Interpretation (TIN)
    Problem Resolution ID TIN.X.0059
    Raised 1970-01-01 08:00
    Updated 2003-03-13 08:00
    Published 1995-08-09 08:00
    Product Standard Commands and Utilities V2 (UNIX 95)
    Certification Program The Open Brand certification program
    Test Suite VSC version 4.1.4
    Test Identification POSIX.shell/shell 399
    Specification Commands and Utilities Issue 4 Version 2
    Location in Spec See Problem Text
    Problem Summary TIN4C.00002 test fails improperly if implementation does not treat \" as " in unquoted here-documents
    Problem Text
    How the shell should treat a '\\' (backslash) in a here-document when
    no characters in word (here-document delimiter) are quoted was recently
    the subject of a PASC interpretation (PASC 1003.2-92 #102) with
    the final resolution being the standard was unclear on the matter
    and was being forwarded to the sponsor.
    Test Output

    Assertion #399 (A): When no character in 'word' is quoted, then a backslash retains its
    Note: there is an active POSIX.2 interpretation request
    regarding the correct behavior as specified by this
    assertion.
    Standard output isn't the same as file 'test.399.exp'
    diff of "out.stdout" and "test.399.exp":
    *** out.stdout Wed Aug 2 13:39:56 1995
    --- test.399.exp Wed Aug 2 13:39:54 1995
    ***************
    *** 1,3 ****
    line one
    line two
    ! \"test\".${TESTID}.\'pwd\'\xline four
    --- 1,3 ----
    line one
    line two
    ! "test".${TESTID}.\'pwd\'xline four
    Assertion Result: FAIL

    Review Information

    Review Type TSMA Review
    Start Date null
    Completed null
    Status Complete
    Review Recommendation No Resolution Given
    Review Response
    pasc-1003.2-102 states

    In the description of shell "here-documents" in POSIX.2 subclause 3.7.4,
    the standard states in part:

    If no characters in word [the here-document delimiter] are
    quoted, all lines of the here-document shall be expanded for
    parameter expansion, command substitution and arithmetic
    expansion. In this case, the backslash in the input will
    behave as the backslash inside double-quotes (see 3.2.3).
    However, the double-quote character (") will not be treated
    specially within a here-document, except when the double-quote
    appears within $( ), ` ` or ${ }.

    The reference to section 3.2.3 refers (I believe) to the following text:

    The backslash shall retain its special meaning as an escape
    character (see 3.2.1) only when followed by one of the characters

    $ ` " \ <newline>

    If the here-document delimiter has not been quoted then does section 3.7.4
    modify section 3.2.1 such that backslash is NOT an escape character when
    followed by the double-quote character? That is, does the "However" clause
    mean that '\"' should not be replaced with '"'? For example, consider the
    here-document:

    cat << EOF
    x\"y\"z
    EOF

    The output of this here-document may be either

    x"y"z
    or
    x\"y\"z

    depending on how one reads the specification.

    Interpretation response
    ------------------------
    The standard is unclear on this issue, and no conformance distinction can
    be made between alternative implementations based on this. This is being
    referred to the sponsor.

    Anticipating future alignment of the POSIX 2003.2 method(s)
    which the test(s) listed are based on with this interpretation
    a Temporary Interpretation is recommended.

    Review Type SA Review
    Start Date null
    Completed null
    Status Complete
    Review Resolution Temporary Interpretation (TIN)
    Review Conclusion
    A Temporary Interpretation is granted.

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