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Re^2: sort based on last and first value

by soonix (Monsignor)
on Aug 27, 2013 at 09:47 UTC ( #1051099=note: print w/replies, xml ) Need Help??


in reply to Re: sort based on last and first value
in thread sort based on last and first value

just as I was arduously composing this, which does roughly the same:
my %latest; for (sort <INFO>) { # by date my ($date, $path) = split "/", $_, 2; # assuming these are compl +ete paths $latest{$path} = $_; # newer overwrites older } # output ordered by "path" values print $latest{$_} for sort keys %latest;

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[davido]: or on ubuntu /var/run/utmp
[Corion]: Otherwise, I would imagine that a user with a process still alive would lock that information in memory.
[davido]: so last -f /var/run/utmp on ubuntu provides similar (though more verbose) info
[oiskuu]: glibc getlogin just does ttyname() and falls back on getutline(); it's not security related at all. (reminds me of sendmail and remote finger services of the naive early spam era)
[Corion]: But yes, "who started this process" is interesting information :)
[tye]: no, I really believe that "login user" was added as a fundamental bit of info about each process in order to enhance the usefulness of auditing
[Corion]: Ah - if that information is saved in a file, then you could theoretically spam that file and confuse getlogin(). So, don't use it for authentication :)
[tye]: that is what getlogin() certainly *used* to do. I don't believe that is what it certainly should do.
[davido]: /var/run/utmp is 664 i think.
[tye]: Note that my "man getlogin" says that it uses stdin when it should use /dev/tty (calling a glibc bug). But that does not appear to be the case when I test it. But maybe Perl's getlogin() is not using glibc's getlogin().

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