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Full Discussion: Extracting records with unique fields from a fixed width txt file
Top Forums Shell Programming and Scripting Extracting records with unique fields from a fixed width txt file Post 302165872 by KevinADC on Saturday 9th of February 2008 03:43:41 PM
Old 02-09-2008
Quote:
#Please describe what is going on here.
$names{"$first,$last"}={count => ++$count{"$first,$last"},
name => "$first $mi $last $state",
};
I'll try....

$names{"$first,$last"} creates a hash key from the first and last name.

its' value is in turn a hash:

Code:
$names{"$first,$last"} = {count=>'' , name => '' };

the "count" keys value is the value of another hash: %count, which is keeping count of how many times the first,last names are found:

Code:
++$count{"$first,$last"}

so we can determine later if it is a unique combination or not. If it has a count of 1 (one) then it is unique.

the "name" keys is just the original line from the file which we use to print to the output file if the value of the "count" key is 1 (one).

You can uncomment the lines that say to "uncomment for debugging" and you will see the data structure of %names printed when the script finishes running.
 

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LEARN ABOUT REDHAT

queue

queue(n)							Tcl Data Structures							  queue(n)

NAME

       queue - Create and manipulate queue objects

SYNOPSIS

       package require Tcl 8.2

       package require struct ?1.2.1?

       queueName option ?arg arg ...?

       queueName clear

       queueName destroy

       queueName get ?count?

       queueName peek ?count?

       queueName put item ?item ...?

       queueName size

DESCRIPTION

       The  ::struct::queue command creates a new queue object with an associated global Tcl command whose name is queueName.  This command may be
       used to invoke various operations on the queue.	It has the following general form:

       queueName option ?arg arg ...?
	      Option and the args determine the exact behavior of the command.	The following commands are possible for queue objects:

       queueName clear
	      Remove all items from the queue.

       queueName destroy
	      Destroy the queue, including its storage space and associated command.

       queueName get ?count?
	      Return the front count items of the queue and remove them from the queue.  If count is not specified, it defaults to 1.  If count is
	      1, the result is a simple string; otherwise, it is a list.  If specified, count must be greater than or equal to 1.  If there are no
	      items in the queue, this command will return count empty strings.

       queueName peek ?count?
	      Return the front count items of the queue, without removing them from the queue.	If count is not specified, it defaults to  1.	If
	      count  is  1,  the  result is a simple string; otherwise, it is a list.  If specified, count must be greater than or equal to 1.	If
	      there are no items in the queue, this command will return count empty strings.

       queueName put item ?item ...?
	      Put the item or items specified into the queue.  If more than one item is given, they will be added in the order they are listed.

       queueName size
	      Return the number of items in the queue.

KEYWORDS

       stack, matrix, tree, graph

struct								       1.2.1								  queue(n)
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