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    SubjectRe: binfmt_script and ^M
    On Mon, 5 Mar 2001, Paul Flinders wrote:

    > Jeff Mcadams wrote:
    >
    > > Also sprach Rik van Riel
    > > >On Mon, 5 Mar 2001, John Kodis wrote:
    > > >> On Mon, Mar 05, 2001 at 08:40:22AM -0500, Richard B. Johnson wrote:
    > > >> > Somebody must have missed the boat entirely. Unix does not, never
    > > >> > has, and never will end a text line with '\r'.
    > >
    > > >> Unix does not, never has, and never will end a text line with ' ' (a
    > > >> space character) or with \t (a tab character). Yet if I begin a
    > > >> shell script with '#!/bin/sh ' or '#!/bin/sh\t', the training white
    > > >> space is striped and /bin/sh gets exec'd. Since \r has no special
    > > >> significance to Unix, I'd expect it to be treated the same as any
    > > >> other whitespace character -- it should be striped, and /bin/sh
    > > >> should get exec'd.
    > >
    > > >Makes sense, IMHO...
    > >
    > > That only makes sense if:
    > > #!/bin/shasdf\n
    > > would also exec /bin/sh.
    >
    > POSIX disagrees with you (accd to the manual page)
    >
    > $ man isspace
    > ....
    > isspace()
    > checks for white-space characters. In the "C" and
    > "POSIX" locales, these are: space, form-feed
    > ('\f'), newline ('\n'), carriage return ('\r'),
    > horizontal tab ('\t'), and vertical tab ('\v').

    And what does POSIX say about "#!/bin/sh\r" ?
    In other words: should the kernel look for the interpreter between the !
    and the newline, or [the first space or newline] or the first whitespace?

    IMHO, the first whitespace. Which means that "#!/bin/sh\r" should invoke
    /bin/sh. (though it is junk).

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