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Re^10: true from (-e "") on Windoze (" is an illegal filename character

by ikegami (Pope)
on Sep 19, 2012 at 23:05 UTC ( #994560=note: print w/ replies, xml ) Need Help??


in reply to Re^9: true from (-e "") on Windoze (" is an illegal filename character
in thread true from (-e "") on Windoze

No, I want to change it because the current behaviour is not reasonable. I need a function that checks if file exists, -e is suppose to be that function, but you're telling me it's not.


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Re^11: true from (-e "") on Windoze (" is an illegal filename character
by BrowserUk (Pope) on Sep 19, 2012 at 23:15 UTC
    . I need a function that checks if file exists

    Then don't ask it: "do any files exist".


    With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
    Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
    "Science is about questioning the status quo. Questioning authority".
    In the absence of evidence, opinion is indistinguishable from prejudice.

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Re^11: true from (-e "") on Windoze (" is an illegal filename character
by syphilis (Canon) on Sep 20, 2012 at 01:58 UTC
    I need a function that checks if file exists

    Seems to me that (on Windows) we can be assured that the specified $file exists if any one of the following three conditions returns true:
    -T $file || -B $file defined -T $file defined -B $file
    I was also wondering about using -f instead of -e. Are there any files on Windows that will report false for -f ? (If so, then we can't use -f as a test for existence.)

    Someone really ought to file a bug report about this because the perldoc -f -X documentation does *not* match the behaviour wrt '-e'.
    That documentation implies that -e '""' will return true only if a file named "" exists.
    Either the behaviour ought to change to fit the documentation, or the documentation be amended to fit the behaviour.
    The documentation also implies that defined -f '""' will return false (but it doesn't).
    Here's what I ran as a check:
    #!perl -l use warnings; print "-f:"; -f '""' ? print "Returned True (unwanted behaviour)\n" : print "Returned False (wanted behaviour)\n"; print "defined -f:"; defined -f '""' ? print "Returned True (unwanted behaviour)\n" : print "Returned False (wanted behaviour)\n"; print "-T || -B:"; (-T '""' || -B '""') ? print "Returned True (unwanted behaviour)\n" : print "Returned False (wanted behaviour)\n"; print "defined -T:"; defined -T '""' ? print "Returned True (unwanted behaviour)\n" : print "Returned False (wanted behaviour)\n"; print "defined -B:"; defined -B '""' ? print "Returned True (unwanted behaviour)\n" : print "Returned False (wanted behaviour)\n";
    And here's the output I got:
    -f: Returned False (wanted behaviour) defined -f: Returned True (unwanted behaviour) -T || -B: Returned False (wanted behaviour) defined -T: Returned False (wanted behaviour) defined -B: Returned False (wanted behaviour)
    I don't mind filing a bug report about this, but I'll wait for comments about that first (in case I've overlooked something).

    Cheers,
    Rob

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