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Re: if statement question

by sundialsvc4 (Abbot)
on Dec 14, 2012 at 04:30 UTC ( #1008769=note: print w/replies, xml ) Need Help??

in reply to if statement question

Obviously, the question here .. if there is a question here .. is “to what extent is the computer’s actual response to this statement, as-written, likely to be a surprise?”     If you can say with confidence that the possible values of the variable in question fall into a particular scope, then you have no surprise, hence no problem.   If, on the other hand, there might be certainty, then a more stringent way of expressing what you actually want the computer to do, might be better at preventing “those damnable surprises.”   There really isn’t enough in the OP to say more.   But we do know that, in the end, the computer will do what you said, not what you meant.   Hence, the most-precise way of expressing “what you meant” is often a way to conserve your ever more precious hair-follicles.

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[Corion]: Maybe doing a double-fork (daemonizing) can make go that information away, but maybe not
[Corion]: But I think my knowledge of unix/Linux datastructures is several decades out of date, so I don't really know what information it keeps on processes
[oiskuu]: The useful bits that relate to your process can be found under /proc/self. What information are you thinking of? Tty name?
[tye]: I just daemonized and getlogin() still knew who I had been.
[tye]: perhaps loginuid ? Not that I concede that something not being in /proc means it is not useful.
[Corion]: tye: That's really interesting, but maybe it is because getlogin() returns the name, or the uid, so if that user has been replaced by another user with the same uid in the meantime, that's no problem to the system...

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