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Full Discussion: Compare specific columns between two files having different layouts
Top Forums Shell Programming and Scripting Compare specific columns between two files having different layouts Post 302451845 by felipe.vinturin on Wednesday 8th of September 2010 07:55:27 AM
Old 09-08-2010
Here is a simple way:

Code:
open FIRFILE "file1.txt" or die "Unable to open file: [$!]";
open SECFILE "file2.txt" or die "Unable to open file: [$!]";

# Start with empty hashes
my %firHash = ();
my %secHash = ();

# Fill the first hash
while (<FIRFILE>)
{
	@fileColumns = split(/,/);
	my $ident = $fileColumns[0];
	
	$firHash{$ident} = $_;
}

# Fill the second hash
while (<SECFILE>)
{
	@fileColumns = split(/,/);
	my $ident = $fileColumns[0];
	
	$secHash{$ident} = $_;
}

for (my($secHashKey, $secHashValue) = each(%secHash))
{
	$firHashValue = $firHash{$secHashKey};
	
	# $firHashValue
	# $secHashValue
	# Here you can compare the values you need!
}

Regards.
This User Gave Thanks to felipe.vinturin For This Post:
gpsridhar
 

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LEARN ABOUT MOJAVE

colrm

COLRM(1)						    BSD General Commands Manual 						  COLRM(1)

NAME

     colrm -- remove columns from a file

SYNOPSIS

     colrm [start [stop]]

DESCRIPTION

     The colrm utility removes selected columns from the lines of a file.  A column is defined as a single character in a line.  Input is read
     from the standard input.  Output is written to the standard output.

     If only the start column is specified, columns numbered less than the start column will be written.  If both start and stop columns are spec-
     ified, columns numbered less than the start column or greater than the stop column will be written.  Column numbering starts with one, not
     zero.

     Tab characters increment the column count to the next multiple of eight.  Backspace characters decrement the column count by one.

ENVIRONMENT

     The LANG, LC_ALL and LC_CTYPE environment variables affect the execution of colrm as described in environ(7).

EXIT STATUS

     The colrm utility exits 0 on success, and >0 if an error occurs.

SEE ALSO

     awk(1), column(1), cut(1), paste(1)

HISTORY

     The colrm command appeared in 3.0BSD.

BSD
								  August 4, 2004							       BSD
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