shell programming

#1 (**permalink**) 02-11-2008

Hi iam new to shell programming. I would like to ask one dought abt the file
handling in unix.

Iam having a file1 as follows:

ASDERFCX1234567890123456
POIUYTRE0098765432123456
BVCXCVBN0955644411111111

File2

Code:

ASDERFCX1234567890123456  kill@abc.com                                                                                          2008-02-020005009.55 0000000 00100.00 2008-03-01 JILL,POWER J                              000000000000006.16 000000000000000.00 CBB00010000000911

The above is a single line in file2. there are many lines like this.

So i need to check compare the file1 with file2(1st column). If that info matches in file 2 then i need to paste file 1 in file2 1st column and othe other coulumn in file2 should remain same without any space modifications.

Most important is records present in file 1 should be there in file2 and other lines in file 2 should be deleted in file2.

Please give me the soulution to resolve this problem.

Thanks in advance.

KevinADC · #2 (**permalink**) 02-11-2008

if the line in file1 matches the first column in file2, why would you need to paste it to file2? It's already in file2.

#3 (**permalink**) 02-11-2008

Sorry ....I am over confused about this issue.

If the file 1 is matching with the file2 column 1, then i need to select that row alone and write it in to new file.

That;s it.

Thanks for your valuble time.

KevinADC · #4 (**permalink**) 02-11-2008

I only know perl well enough to do this:

Code:

#!/usr/bin/perl
use warnings;
use strict;
my %file2;
open (FILE2, '<' , 'path/to/file2') or die "$!";
while(<FILE2>){
    $file2{(split(/\s+/))[0]}=1;
}
close FILE2;
open (FILE1, '<' , 'path/to/file1') or die "$!";
open (OUT, '>' , 'path/to/outputfile') or die "$!";
while(<FILE1>){
    chomp;
    if (exists $file2{$_}) {
        print OUT "$_\n";
    }
}
close FILE1;
close OUT;

KevinADC · #5 (**permalink**) 02-11-2008

You want to read the smaller of the two files into a hash, so if file1 is considerbaly smaller than file2, file1 should be read into a hash to compare to file2 instead of how I did it. If both files are the same or nearly the same size it does not matter.

#6 (**permalink**) 02-11-2008

Thanks for your time, and solution.

But ineed solution in shell program, ...i dion't know perl.sorry for that

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