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Re: filehandle regex

by JavaFan (Canon)
on Nov 16, 2010 at 20:59 UTC ( #871830=note: print w/ replies, xml ) Need Help??

in reply to filehandle regex

To print the previous line, one way of doing it is:

my $prev = ""; while (<ORA>) { print $prev if /^Func_file_permission$/; $prev = $_; }

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Re^2: filehandle regex
by pinnacle (Acolyte) on Nov 17, 2010 at 00:21 UTC

    Thanks for the solution it works!! One thing I don't understand why we are using my $prev = ""; also $prev = $_; due to which I am getting previous line from the file

    What's the magic behind it


      Yes, it will also work, but then the script will not run under use strict;.


      A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James

      The my $prev part is there to properly declare the variable. The = "" is there to not have warnings if the first line actually matches. The ; is there to separate statements.

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