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Full Discussion: Columns comparision of two large size files and printing the difference
Top Forums Shell Programming and Scripting Columns comparision of two large size files and printing the difference Post 302460896 by k_manimuthu on Friday 8th of October 2010 12:20:57 AM
Old 10-08-2010
Code:
#! /usr/bin/perl 

$file1 = 'a.txt'; 
$file2 = 'b.txt'; 

open(R,$file1) ;
open(P,$file2) ;

$hash1{$2}=$1 while (<R>=~ m{<\s*([^,]+),\s*([^,]+)}g);
$hash2{$2}=$1 while (<P>=~ m{<\s*([^,]+),\s*([^,]+)}g);

for (keys %hash1){
print "\n$hash1{$_}, $_ ----- $hash2{$_}, $_" if ($hash1{$_} ne $hash2{$_});
}

 

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LEARN ABOUT BSD

pr

PR(1)							      General Commands Manual							     PR(1)

NAME

       pr - print file

SYNOPSIS

       pr [ option ] ...  [ file ] ...

DESCRIPTION

       Pr  produces a printed listing of one or more files.  The output is separated into pages headed by a date, the name of the file or a speci-
       fied header, and the page number.  If there are no file arguments, pr prints its standard input.

       Options apply to all following files but may be reset between files:

       -n     Produce n-column output.

       +n     Begin printing with page n.

       -h     Take the next argument as a page header.

       -wn    For purposes of multi-column output, take the width of the page to be n characters instead of the default 72.

       -f     Use formfeeds instead of newlines to separate pages.  A formfeed is assumed to use up two blank lines at the top of a  page.   (Thus
	      this option does not affect the effective page length.)

       -ln    Take the length of the page to be n lines instead of the default 66.

       -t     Do not print the 5-line header or the 5-line trailer normally supplied for each page.

       -sc    Separate columns by the single character c instead of by the appropriate amount of white space.  A missing c is taken to be a tab.

       -m     Print all files simultaneously, each in one column,

       Inter-terminal messages via write(1) are forbidden during a pr.

FILES

       /dev/tty?  to suspend messages.

SEE ALSO

       cat(1)

DIAGNOSTICS

       There are no diagnostics when pr is printing on a terminal.

4th Berkeley Distribution					  April 29, 1985							     PR(1)
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