title: Using awk to create a KML file from another KML file
body: <p>Trying to take a very large KML file (sample.kml) of this:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8" ?&gt;
  &lt;kml xmlns="http://www.opengis.net/kml/2.2"&gt;
  &lt;Document id="root_doc"&gt;
  &lt;Schema name="tl_2010_19013_tabblock10" id="tl_2010_19013_tabblock10"&gt;
      &lt;SimpleField name="STATEFP10" type="string"&gt;&lt;/SimpleField&gt;
      &lt;SimpleField name="COUNTYFP10" type="string"&gt;&lt;/SimpleField&gt;
      &lt;SimpleField name="TRACTCE10" type="string"&gt;&lt;/SimpleField&gt;
      &lt;SimpleField name="BLOCKCE10" type="string"&gt;&lt;/SimpleField&gt;
      &lt;SimpleField name="GEOID10" type="string"&gt;&lt;/SimpleField&gt;
      &lt;SimpleField name="NAME10" type="string"&gt;&lt;/SimpleField&gt;
      &lt;SimpleField name="MTFCC10" type="string"&gt;&lt;/SimpleField&gt;
      &lt;SimpleField name="UR10" type="string"&gt;&lt;/SimpleField&gt;
      &lt;SimpleField name="UACE10" type="string"&gt;&lt;/SimpleField&gt;
      &lt;SimpleField name="UATYP10" type="string"&gt;&lt;/SimpleField&gt;
      &lt;SimpleField name="FUNCSTAT10" type="string"&gt;&lt;/SimpleField&gt;
      &lt;SimpleField name="ALAND10" type="float"&gt;&lt;/SimpleField&gt;
      &lt;SimpleField name="AWATER10" type="float"&gt;&lt;/SimpleField&gt;
      &lt;SimpleField name="INTPTLAT10" type="string"&gt;&lt;/SimpleField&gt;
      &lt;SimpleField name="INTPTLON10" type="string"&gt;&lt;/SimpleField&gt;
  &lt;/Schema&gt;
  &lt;Folder&gt;&lt;name&gt;tl_2010_19013_tabblock10&lt;/name&gt;
  &lt;Placemark&gt;
      &lt;Style&gt;&lt;LineStyle&gt;&lt;color&gt;ff0000ff&lt;/color&gt;&lt;/LineStyle&gt;&lt;PolyStyle&gt;&lt;fill&gt;0&lt;/fill&gt;&lt;/PolyStyle&gt;&lt;/Style&gt;
      &lt;ExtendedData&gt;&lt;SchemaData schemaUrl="#tl_2010_19013_tabblock10"&gt;
          &lt;SimpleData name="STATEFP10"&gt;19&lt;/SimpleData&gt;
          &lt;SimpleData name="COUNTYFP10"&gt;013&lt;/SimpleData&gt;
          &lt;SimpleData name="TRACTCE10"&gt;002700&lt;/SimpleData&gt;
          &lt;SimpleData name="BLOCKCE10"&gt;2051&lt;/SimpleData&gt;
          &lt;SimpleData name="GEOID10"&gt;190130027002051&lt;/SimpleData&gt;
          &lt;SimpleData name="NAME10"&gt;Block 2051&lt;/SimpleData&gt;
          &lt;SimpleData name="MTFCC10"&gt;G5040&lt;/SimpleData&gt;
          &lt;SimpleData name="UR10"&gt;R&lt;/SimpleData&gt;
          &lt;SimpleData name="FUNCSTAT10"&gt;S&lt;/SimpleData&gt;
          &lt;SimpleData name="ALAND10"&gt;3890&lt;/SimpleData&gt;
          &lt;SimpleData name="AWATER10"&gt;0&lt;/SimpleData&gt;
          &lt;SimpleData name="INTPTLAT10"&gt;+42.4779525&lt;/SimpleData&gt;
          &lt;SimpleData name="INTPTLON10"&gt;-092.2489677&lt;/SimpleData&gt;
      &lt;/SchemaData&gt;&lt;/ExtendedData&gt;
        &lt;Polygon&gt;&lt;outerBoundaryIs&gt;&lt;LinearRing&gt;&lt;coordinates&gt;-92.248857,42.476255 -92.248998,42.476256 -92.24906,42.479886 -92.248968,42.479915 -92.248857,42.476255&lt;/coordinates&gt;&lt;/LinearRing&gt;&lt;/outerBoundaryIs&gt;&lt;/Polygon&gt;
    &lt;/Placemark&gt;
    &lt;Placemark&gt;
      &lt;Style&gt;&lt;LineStyle&gt;&lt;color&gt;ff0000ff&lt;/color&gt;&lt;/LineStyle&gt;&lt;PolyStyle&gt;&lt;fill&gt;0&lt;/fill&gt;&lt;/PolyStyle&gt;&lt;/Style&gt;
      &lt;ExtendedData&gt;&lt;SchemaData schemaUrl="#tl_2010_19013_tabblock10"&gt;
          &lt;SimpleData name="STATEFP10"&gt;19&lt;/SimpleData&gt;
          &lt;SimpleData name="COUNTYFP10"&gt;013&lt;/SimpleData&gt;
          &lt;SimpleData name="TRACTCE10"&gt;002800&lt;/SimpleData&gt;
          &lt;SimpleData name="BLOCKCE10"&gt;3066&lt;/SimpleData&gt;
          &lt;SimpleData name="GEOID10"&gt;190130028003066&lt;/SimpleData&gt;
          &lt;SimpleData name="NAME10"&gt;Block 3066&lt;/SimpleData&gt;
          &lt;SimpleData name="MTFCC10"&gt;G5040&lt;/SimpleData&gt;
          &lt;SimpleData name="UR10"&gt;R&lt;/SimpleData&gt;
          &lt;SimpleData name="FUNCSTAT10"&gt;S&lt;/SimpleData&gt;
          &lt;SimpleData name="ALAND10"&gt;2669021&lt;/SimpleData&gt;
          &lt;SimpleData name="AWATER10"&gt;0&lt;/SimpleData&gt;
          &lt;SimpleData name="INTPTLAT10"&gt;+42.3771200&lt;/SimpleData&gt;
          &lt;SimpleData name="INTPTLON10"&gt;-092.1523795&lt;/SimpleData&gt;
      &lt;/SchemaData&gt;&lt;/ExtendedData&gt;
        &lt;Polygon&gt;&lt;outerBoundaryIs&gt;&lt;LinearRing&gt;&lt;coordinates&gt;-92.142669,42.369695 -92.152457,42.369649 -92.155691,42.369641 -92.157833,42.369636 -92.1613,42.369628 -92.162245,42.369626 -92.162143,42.376605 -92.162074,42.380176 -92.162012,42.383357 -92.162,42.383994 -92.161987,42.38463 -92.142533,42.384571 -92.142555,42.382183 -92.142614,42.376921 -92.142638,42.373725 -92.142669,42.369695&lt;/coordinates&gt;&lt;/LinearRing&gt;&lt;/outerBoundaryIs&gt;&lt;/Polygon&gt;
    &lt;/Placemark&gt;
    &lt;Placemark&gt;
      &lt;Style&gt;&lt;LineStyle&gt;&lt;color&gt;ff0000ff&lt;/color&gt;&lt;/LineStyle&gt;&lt;PolyStyle&gt;&lt;fill&gt;0&lt;/fill&gt;&lt;/PolyStyle&gt;&lt;/Style&gt;
      &lt;ExtendedData&gt;&lt;SchemaData schemaUrl="#tl_2010_19013_tabblock10"&gt;
          &lt;SimpleData name="STATEFP10"&gt;19&lt;/SimpleData&gt;
          &lt;SimpleData name="COUNTYFP10"&gt;013&lt;/SimpleData&gt;
          &lt;SimpleData name="TRACTCE10"&gt;002800&lt;/SimpleData&gt;
          &lt;SimpleData name="BLOCKCE10"&gt;3114&lt;/SimpleData&gt;
          &lt;SimpleData name="GEOID10"&gt;190130028003114&lt;/SimpleData&gt;
          &lt;SimpleData name="NAME10"&gt;Block 3114&lt;/SimpleData&gt;
          &lt;SimpleData name="MTFCC10"&gt;G5040&lt;/SimpleData&gt;
          &lt;SimpleData name="UR10"&gt;R&lt;/SimpleData&gt;
          &lt;SimpleData name="FUNCSTAT10"&gt;S&lt;/SimpleData&gt;
          &lt;SimpleData name="ALAND10"&gt;3812216&lt;/SimpleData&gt;
          &lt;SimpleData name="AWATER10"&gt;0&lt;/SimpleData&gt;
          &lt;SimpleData name="INTPTLAT10"&gt;+42.3221995&lt;/SimpleData&gt;
          &lt;SimpleData name="INTPTLON10"&gt;-092.1314948&lt;/SimpleData&gt;
      &lt;/SchemaData&gt;&lt;/ExtendedData&gt;
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-92.15339,42.327443 -92.153479,42.327492 -92.153516,42.32751 -92.153551,42.327519 -92.153586,42.327537 -92.153634,42.327538 -92.153669,42.327556 -92.153717,42.327556 -92.15386,42.327594 -92.154001,42.327666 -92.154035,42.327693 -92.154142,42.327738 -92.154178,42.327748 -92.154213,42.327766 -92.154261,42.327802 -92.154332,42.327838 -92.154401,42.327884 -92.154438,42.327902 -92.154543,42.327983 -92.15466,42.328046 -92.154719,42.328091 -92.154765,42.328144 -92.154883,42.328252 -92.154905,42.328279 -92.154941,42.328306 -92.154975,42.32836 -92.154999,42.328387 -92.155056,42.328502 -92.155079,42.328529 -92.155091,42.328556 -92.155126,42.328591 -92.155136,42.328618 -92.15537,42.328834 -92.155499,42.328959 -92.155557,42.329022 -92.155675,42.329129 -92.15578,42.32921 -92.155814,42.329246 -92.155851,42.329273 -92.155909,42.329336 -92.155979,42.329399 -92.156049,42.329452 -92.156143,42.329533 -92.156154,42.32956 -92.15619,42.329578 -92.156236,42.329614 -92.156319,42.329695 -92.156377,42.329739 -92.156517,42.329874 -92.156529,42.329901 -92.156553,42.329927 -92.15661,42.330017 -92.15662,42.330044 -92.156644,42.330071 -92.156656,42.330097 -92.156678,42.330124 -92.15669,42.330151 -92.156714,42.330178 -92.156724,42.330204 -92.156748,42.330231 -92.15676,42.330258 -92.156782,42.330284 -92.156794,42.33032 -92.156817,42.330347 -92.156885,42.330463 -92.156931,42.330578 -92.15693,42.330614 -92.156942,42.330641 -92.156925,42.331428 -92.156935,42.331491 -92.156948,42.331517 -92.156971,42.331544 -92.157029,42.331589 -92.157167,42.331719 -92.157196,42.331749 -92.157216,42.331779 -92.157245,42.331808 -92.157384,42.332037 -92.157427,42.332083 -92.157525,42.332202 -92.157543,42.332232 -92.157631,42.332314 -92.15767,42.332329 -92.157817,42.332441 -92.157875,42.332494 -92.157893,42.332524 -92.158078,42.332695 -92.158147,42.332748 -92.158186,42.33277 -92.158226,42.332785 -92.158255,42.332808 -92.158334,42.332838 -92.158413,42.332876 -92.15853,42.332944 -92.158764,42.333123 -92.158803,42.333146 -92.158843,42.333176 -92.158872,42.333206 -92.159127,42.333386 -92.159322,42.333506 -92.159351,42.333535 -92.159517,42.333648 -92.159636,42.333715 -92.159665,42.333745 -92.159703,42.333761 -92.159831,42.333858 -92.159869,42.333873 -92.159929,42.333918 -92.160084,42.334008 -92.160203,42.334069 -92.160262,42.334113 -92.160379,42.334181 -92.160526,42.334293 -92.160564,42.334316 -92.160593,42.334339 -92.160683,42.334384 -92.160898,42.334519 -92.160937,42.334534 -92.160966,42.334556 -92.161006,42.334572 -92.161134,42.334662 -92.161192,42.334714 -92.161259,42.334766 -92.1613,42.334789 -92.161329,42.334819 -92.161436,42.334879 -92.161495,42.334924 -92.161612,42.334991 -92.161672,42.335037 -92.161701,42.335067 -92.161866,42.335179 -92.161984,42.335224 -92.162063,42.335247 -92.162103,42.335255 -92.162142,42.33527 -92.162171,42.335293 -92.162181,42.335323 -92.16229,42.335371 -92.162641,42.335563 -92.162712,42.335609 -92.16294,42.335729 -92.163049,42.335775 -92.16312,42.335812 -92.163168,42.33583 -92.163204,42.335849 -92.163241,42.335859 -92.163386,42.335923 -92.163477,42.33597 -92.163664,42.336113 -92.162248,42.33718 -92.160963,42.338149 -92.160811,42.338256 -92.160649,42.338354 -92.160479,42.338444 -92.1603,42.338525 -92.159617,42.338751 -92.157873,42.338913 -92.157549,42.338938 -92.157224,42.338952 -92.156973,42.338955 -92.153683,42.338952 -92.15334,42.338956 -92.152975,42.338972 -92.15261,42.338998 -92.15246,42.339014 -92.152456,42.338671 -92.152451,42.3383 -92.152444,42.33768 -92.152391,42.333372 -92.152351,42.330106 -92.152336,42.329948 -92.152307,42.329791 -92.152263,42.329636 -92.152204,42.329484 -92.152177,42.329427 -92.152132,42.329334 -92.152046,42.329189 -92.151946,42.329049 -92.151834,42.328914 -92.15171,42.328785 -92.151573,42.328663 -92.151426,42.328548 -92.151268,42.328441 -92.151056,42.328318 -92.150925,42.328253 -92.150741,42.328173 -92.15055,42.328102 -92.150352,42.328041 -92.15015,42.32799 -92.148237,42.327567 -92.148234,42.327143 -92.148109,42.32692 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-92.113697,42.323113 -92.113698,42.323043 -92.113676,42.322975 -92.113642,42.322911 -92.113626,42.322868 -92.113562,42.322741 -92.113538,42.322672 -92.113485,42.322414 -92.113487,42.322283 -92.113472,42.322226 -92.113456,42.322201 -92.113457,42.322132 -92.113435,42.321957 -92.113437,42.321888 -92.113448,42.321813 -92.113466,42.321744 -92.113475,42.321675 -92.113485,42.321638 -92.113502,42.321613 -92.113503,42.321582 -92.11353,42.321513 -92.11355,42.321376 -92.113552,42.321269 -92.113522,42.321131 -92.113466,42.320974 -92.11339,42.320682 -92.113339,42.320556 -92.113319,42.320532 -92.113269,42.320445 -92.113238,42.320422 -92.113206,42.320366 -92.113186,42.320343 -92.113167,42.320296 -92.113137,42.320241 -92.113116,42.320162 -92.11311,42.320045 -92.1131,42.319997 -92.113101,42.319959 -92.11309,42.319927 -92.113096,42.319646 -92.113108,42.319615 -92.113109,42.319576 -92.113121,42.319545 -92.113125,42.319364 -92.113115,42.319325 -92.113115,42.319294 -92.113085,42.319232 -92.113044,42.319169 -92.113014,42.319113 -92.112869,42.318994 -92.112775,42.31897 -92.112714,42.318883 -92.112703,42.318852 -92.112684,42.31882 -92.112706,42.31875 -92.112727,42.318719 -92.112856,42.318635 -92.112921,42.318549 -92.112933,42.318518 -92.112933,42.318487 -92.112943,42.318456 -92.112945,42.318393 -92.112957,42.31833 -92.112958,42.3183 -92.11297,42.318268 -92.113023,42.318191 -92.113112,42.318107 -92.11312,42.318083 -92.113102,42.317988 -92.113071,42.317871&lt;/coordinates&gt;&lt;/LinearRing&gt;&lt;/outerBoundaryIs&gt;&lt;/Polygon&gt;
    &lt;/Placemark&gt;
  &lt;/Folder&gt;
  &lt;/Document&gt;&lt;/kml&gt;
  </code></pre>
  
  <p>And make a new file that only include the Placemarks with a GEOID10 that is in this list (eligible.txt):</p>
  
  <pre><code>190130028003089
  190130028003087
  190130028003086
  190130028003085
  190130028003084
  190130028003082
  190130028003057
  190130028003044
  190130028003043
  190130028003042
  190130028003041
  190130028003031
  190130028003030
  190130028003028
  190130028003027
  190130028003023
  190130028003022
  190130028003021
  190130028003020
  190130028003018
  190130028003016
  190130028003009
  190130028003003
  190130028003001
  190130028001119
  190130028001118
  190130028001103
  190130028001095
  </code></pre>
  
  <p>Here's my attempt at a hack, many thanks to <a href="https://stackoverflow.com/users/4162356/james-brown">James Brown</a> for inspiring me to read about awk.</p>
  
  <p>./bensawk &lt; eligible.txt</p>
  
  <p>#!/bin/bash 
      while read line; do
       awk -v p="$line" '
      // { d=1; b=""; }         # d is delete, b is buffer, reset both
      { b=b $0 (/&lt;/Placemark>/?"":ORS) }  # gather data to d
      /p/ {d=0}  # If match set d=0
      /&lt;/Placemark>/ &amp;&amp; d=0 { print b }  # if line matches print b
      ' sample.kml >> out
      done</p>