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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 SUSE

xkbfreegeomoverlaykeys

XkbFreeGeomOverlayKeys(3)					   XKB FUNCTIONS					 XkbFreeGeomOverlayKeys(3)

NAME

       XkbFreeGeomOverlayKeys - Free keys in an overlay row

SYNOPSIS

       void XkbFreeGeomOverlayKeys (XkbRowPtr row, int first, int count, Bool free_all);

ARGUMENTS

       - row  row in which keys should be freed

       - first
	      first key to be freed

       - count
	      number of keys to be freed

       - free_all
	      True => all keys are freed

DESCRIPTION

       Xkb  provides a number of functions to allocate and free subcomponents of a keyboard geometry. Use these functions to create or modify key-
       board geometries.  Note that these functions merely allocate space for the new element(s), and it is up	to  you  to  fill  in  the  values
       explicitly  in  your  code. These allocation functions increase sz_* but never touch num_* (unless there is an allocation failure, in which
       case they reset both sz_* and num_* to zero). These functions return Success if they succeed, BadAlloc if they are  not	able  to  allocate
       space, or BadValue if a parameter is not as expected.

       If  free_all  is True, all keys are freed regardless of the value of first and count.  Otherwise, the number of keys specified by count are
       freed, beginning with the key specified by first in the specified row.

RETURN VALUES

       Success	      The XkbFreeGeomOverlayKeys function returns Success if there are no allocation or argument errors.

DIAGNOSTICS

       BadAlloc       Unable to allocate storage

       BadValue       An argument is out of range

X Version 11							   libX11 1.3.2 					 XkbFreeGeomOverlayKeys(3)
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