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Top Forums Shell Programming and Scripting sed newbie scripting assistance Post 302686019 by agama on Monday 13th of August 2012 09:55:01 PM
Old 08-13-2012
It's not trying to load the whole file in memory. It caches one copy of the first bits of a new line (things up to "fruit") and the list of 'items' that follow. When the first bits change, the record, with the summary of items, is written and the caching/list starts anew (list = ""). So, the only significant amount of "stuff" that is ever held in memory is the list of items.


Now, if that list is huge, then the programme could be amended to write them out as it finds them. My assumption was that the list wasn't going to be more than 1 or 2 K.

---------- Post updated at 21:55 ---------- Previous update was at 21:42 ----------

Turns out that printing the list as we go is a simpler programme; just didn't see it that way the other night.


Code:
awk '
    {
        x = $0;
        sub( "fruit.*", "", x );
        gsub( ".*fruit ", "", $0 );
         if( x != last )       # if first bits are different, print newline (if needed) and the current line
            printf( "%s%sfruit %s", NR > 1 ? "\n" : "", x, $0 );
         else         # first bits are the same, print just what is after fruit
            printf( "%s%s", NR > 1 ? ", " : "", $0 );
        last = x;
    }
     END { printf( "\n" );  }     # must have final newline
' input-file

 

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ARRAY_SHIFT(3)								 1							    ARRAY_SHIFT(3)

array_shift - Shift an element off the beginning of array

SYNOPSIS
mixed array_shift (array &$array) DESCRIPTION
array_shift(3) shifts the first value of the $array off and returns it, shortening the $array by one element and moving everything down. All numerical array keys will be modified to start counting from zero while literal keys won't be touched. Note This function will reset(3) the array pointer of the input array after use. PARAMETERS
o $array - The input array. RETURN VALUES
Returns the shifted value, or NULL if $array is empty or is not an array. EXAMPLES
Example #1 array_shift(3) example <?php $stack = array("orange", "banana", "apple", "raspberry"); $fruit = array_shift($stack); print_r($stack); ?> The above example will output: Array ( [0] => banana [1] => apple [2] => raspberry ) and orange will be assigned to $fruit. SEE ALSO
array_unshift(3), array_push(3), array_pop(3). PHP Documentation Group ARRAY_SHIFT(3)
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