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Re: replace/substituion 4th field

by tmharish (Friar)
on Feb 20, 2013 at 08:15 UTC ( #1019732=note: print w/replies, xml ) Need Help??

in reply to replace/substituion 4th field

Considering you have already split up $line, why replace in the original? I would simply join @fields like so:

while (my $line = <$data>) { chomp $line; my @fields = split ",", $line, -1; my $sum = $fields[3]; $fields[3] = 'volemd' if ($fields[3] > 310 ) ; $fields[3] = 'volemd1' if ($fields[3] == 70 ) ; print join( ',', @fields ) . "\n" ; }

Update: Modified as per correction by jwkrahn below.

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Re^2: replace/substituion 4th field
by jwkrahn (Monsignor) on Feb 20, 2013 at 17:04 UTC
    chomp $line; my @fields = split "," , $line; ... print join( ',', @fields ) . "\n" ;

    That won't work correctly on the data provided.    You need to change split "," , $line to split "," , $line, -1.

      Absolutely - Updated above.

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[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().
[oiskuu]: well, run a strace and see what the getlogin does for you.... As I said. SELinux probably has those security labels. But not regular linux.
[tye]: for example, read https://unix. questions/146138/ loginuid-should-be -allowed-to-change -or-not-mutable-or -not
[tye]: I'm not using SELinux and it certainly appears to disagree with you. shrug
[tye]: Since you brought up /proc, oiskuu, I didn't see you respond to my suggestion of 'loginuid'. Does your /proc not have such?

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