Good day Monks, Here's my problem.
I have a text file with content 

name=Document1.doc type=Word author=aAuthor 
name=Document1.doc type=Excel author=bAuthor
name=Document1.doc type=Text author=cAuthor
name=Document1.doc type=Excel author=dAuthor
name=Document1.doc type=Word author=eAuthor

[download]
My problem is to sort this file and write to another (first based on the key "type" and then on the key "author") so that the output file looks like : 
name=Document1.doc type=Excel author=bAuthor
name=Document1.doc type=Excel author=dAuthor
name=Document1.doc type=Text author=cAuthor
name=Document1.doc type=Word author=aAuthor 
name=Document1.doc type=Word author=eAuthor

[download]
What I have tried is to write a function which accepts one key name and sort the file based on that key. Again the function will be invoked with the second key. But when I invoked the function with second key, the output happened to be sorted in second key alone(the first level sorting has gone which is obvious). Is there any way with which I can do this in one stretch.?
Any suggestions welcome. 
#$field is the position of the element (sort key) in the #line
   open INPUT , $input || die $input.$! ;

    while (<INPUT>) {
        @fields = split(" ",$_) ;
        push @{$hash{$fields[$field]}}, $_ ;
        $hash_keys{$fields[$field]} = $fields[$field] unless exists $h
+ash_keys{$fields[1]} ;
    }
    for $element (sort keys %hash_keys) {
        open OUTPUT, ">>$output" || $output.$! ;
        print OUTPUT @{$hash{$element}} ;
        close OUTPUT ;
    }
    close INPUT ;

[download]
Many thanks for your time..

In reply to Sorting with multiple keys by Mandrake

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