{"id":28991,"date":"2025-09-06T06:15:23","date_gmt":"2025-09-06T03:15:23","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/powershell-dizideki-yinelenen-degerleri-bulma\/"},"modified":"2025-09-06T06:15:23","modified_gmt":"2025-09-06T03:15:23","slug":"powershell-dizideki-yinelenen-degerleri-bulma","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/powershell-dizideki-yinelenen-degerleri-bulma\/","title":{"rendered":"PowerShell: Dizideki Yinelenen De\u011ferleri Bulma"},"content":{"rendered":"<p># PowerShell&#8217;de Dizilerde Yinelenen De\u011ferleri Bulma<\/p>\n<p>PowerShell ile \u00e7al\u0131\u015f\u0131rken, s\u0131kl\u0131kla b\u00fcy\u00fck veri k\u00fcmeleriyle u\u011fra\u015f\u0131r ve bu k\u00fcmeler i\u00e7inde yinelenen de\u011ferleri tespit etme ihtiyac\u0131 duyar\u0131z. \u00d6rne\u011fin, bir sunucu park\u0131n\u0131zdaki ayn\u0131 i\u015fletim sistemine sahip bilgisayarlar\u0131 tespit etmek, bir kullan\u0131c\u0131 listesinden yinelenen e-posta adreslerini bulmak veya bir log dosyas\u0131ndaki hata kodlar\u0131n\u0131 analiz etmek gibi bir\u00e7ok senaryoda bu i\u015flemi ger\u00e7ekle\u015ftirmek zorunda kalabiliriz. Bu makalede, PowerShell kullanarak dizilerdeki yinelenen de\u011ferleri bulman\u0131n farkl\u0131 y\u00f6ntemlerini, performans optimizasyonlar\u0131n\u0131 ve ileri d\u00fczey tekniklerini ad\u0131m ad\u0131m \u00f6\u011frenece\u011fiz.  PowerShell&#8217;in g\u00fcc\u00fcnden yararlanarak bu i\u015flemi verimli ve etkili bir \u015fekilde nas\u0131l ger\u00e7ekle\u015ftirebilece\u011finizi ke\u015ffedece\u011fiz.<\/p>\n<p><strong>PowerShell Dizileri ve Temel Kavramlar<\/strong><\/p>\n<p>PowerShell&#8217;de bir dizi (array), ayn\u0131 veri tipinde veya farkl\u0131 veri tiplerinde birden fazla \u00f6\u011feyi saklayan bir veri yap\u0131s\u0131d\u0131r.  Diziler, PowerShell&#8217;de bir\u00e7ok komutun \u00e7\u0131kt\u0131s\u0131n\u0131 tutmak ve veri i\u015fleme i\u015flemlerini ger\u00e7ekle\u015ftirmek i\u00e7in s\u0131kl\u0131kla kullan\u0131l\u0131r.  \u00d6rne\u011fin, <code class=\"language-\">Get-ChildItem<\/code> komutu bir dizin i\u00e7indeki t\u00fcm dosya ve klas\u00f6rleri bir dizi olarak d\u00f6nd\u00fcr\u00fcr.  Bu dizide yinelenen dosya adlar\u0131 veya dosya boyutlar\u0131 olabilir.  Yinelenen de\u011ferleri bulmak i\u00e7in, dizinin elemanlar\u0131n\u0131 kar\u015f\u0131la\u015ft\u0131rarak ayn\u0131 de\u011ferlere sahip olanlar\u0131 tespit etmemiz gerekir.  Bu i\u015flem, dizi boyutu b\u00fcy\u00fcd\u00fck\u00e7e daha karma\u015f\u0131k ve zaman al\u0131c\u0131 hale gelir. Bu y\u00fczden, verimli algoritmalar kullanmak \u00f6nemlidir.<\/p>\n<p><strong>Yeni Ba\u015flayanlar \u0130\u00e7in: Basit Yinelenen De\u011fer Bulma<\/strong><\/p>\n<p>\u0130lk olarak, basit bir y\u00f6ntemle ba\u015flayal\u0131m.  A\u015fa\u011f\u0131daki \u00f6rnekte, bir dizi i\u00e7indeki yinelenen de\u011ferleri bulmak i\u00e7in <code class=\"language-\">Group-Object<\/code> cmdlet&#8217;ini kullanaca\u011f\u0131z.  <code class=\"language-\">Group-Object<\/code>, dizi elemanlar\u0131n\u0131 benzersiz de\u011ferlere g\u00f6re grupland\u0131r\u0131r ve her grubun ka\u00e7 elemandan olu\u015ftu\u011funu g\u00f6sterir.  Yinelenen de\u011ferler, birden fazla elemana sahip gruplarda yer al\u0131r.<\/p>\n<pre class=\"language-powershell\"><code>$myArray = &quot;elma&quot;, &quot;armut&quot;, &quot;elma&quot;, &quot;muz&quot;, &quot;armut&quot;, &quot;kiraz&quot;, &quot;elma&quot;\n$duplicateItems = $myArray | Group-Object | Where-Object {$_.Count -gt 1} | Select-Object -ExpandProperty Name\n\nWrite-Host &quot;Yinelenen \u00f6\u011feler:&quot;\n$duplicateItems<\/code><\/pre>\n<p>Bu kod, \u00f6nce <code class=\"language-\">$myArray<\/code> dizisini olu\u015fturur. Ard\u0131ndan, <code class=\"language-\">Group-Object<\/code> cmdlet&#8217;i ile elemanlar\u0131 gruplar.  <code class=\"language-\">Where-Object<\/code> cmdleti, say\u0131s\u0131 1&#8217;den b\u00fcy\u00fck olan gruplar\u0131 filtreler (yani yinelenenleri se\u00e7er). Son olarak, <code class=\"language-\">Select-Object -ExpandProperty Name<\/code> ile sadece yinelenen elemanlar\u0131n isimlerini al\u0131r\u0131z. \u00c7\u0131kt\u0131, yinelenen &#8220;elma&#8221; ve &#8220;armut&#8221; de\u011ferlerini g\u00f6sterir.  Bu y\u00f6ntem, k\u00fc\u00e7\u00fck diziler i\u00e7in yeterli olsa da, b\u00fcy\u00fck dizilerde performans sorunlar\u0131na yol a\u00e7abilir.<\/p>\n<p><strong>Orta Seviye: Ger\u00e7ek Hayat \u00d6rne\u011fi ve Optimizasyon \u0130pu\u00e7lar\u0131<\/strong><\/p>\n<p>\u015eimdi, ger\u00e7ek bir senaryoya bakal\u0131m.  Bir sistem y\u00f6neticisi olarak, sunucular\u0131n\u0131z\u0131n i\u015fletim sistemlerini i\u00e7eren bir listeye sahipsiniz ve ayn\u0131 i\u015fletim sistemine sahip sunucular\u0131 tespit etmek istiyorsunuz.<\/p>\n<pre class=\"language-powershell\"><code>$servers = @(\n    &quot;Server1:Windows Server 2019&quot;,\n    &quot;Server2:Windows Server 2022&quot;,\n    &quot;Server3:Windows Server 2019&quot;,\n    &quot;Server4:Linux Ubuntu 20.04&quot;,\n    &quot;Server5:Windows Server 2019&quot;,\n    &quot;Server6:Linux CentOS 7&quot;\n)\n\n$osList = $servers | ForEach-Object {$_.Split(&quot;:&quot;)[1]} | Group-Object | Where-Object {$_.Count -gt 1} | Select-Object -ExpandProperty Name\n\nWrite-Host &quot;Yinelenen i\u015fletim sistemleri:&quot;\n$osList<\/code><\/pre>\n<p>Bu kod, \u00f6nce sunucu listesindeki i\u015fletim sistemlerini ay\u0131klar, daha sonra <code class=\"language-\">Group-Object<\/code> kullanarak gruplar ve yinelenenleri filtreler.  Ancak, bu y\u00f6ntem hala b\u00fcy\u00fck listelerde yava\u015f olabilir.  Performans\u0131 iyile\u015ftirmek i\u00e7in, <code class=\"language-\">Group-Object<\/code> yerine bir hashtable kullanabiliriz.  Hashtable&#8217;lar, anahtar-de\u011fer \u00e7iftleri ile \u00e7al\u0131\u015f\u0131r ve h\u0131zl\u0131 arama i\u015flemleri sa\u011flar.<\/p>\n<pre class=\"language-powershell\"><code>$osCount = @{}\n$servers | ForEach-Object {\n    $os = $_.Split(&quot;:&quot;)[1]\n    if ($osCount.ContainsKey($os)) {\n        $osCount[$os]++\n    } else {\n        $osCount[$os] = 1\n    }\n}\n\n$duplicateOS = $osCount.GetEnumerator() | Where-Object {$_.Value -gt 1} | Select-Object -ExpandProperty Name\n\nWrite-Host &quot;Yinelenen i\u015fletim sistemleri (Hashtable kullanarak):&quot;\n$duplicateOS<\/code><\/pre>\n<p>Bu kod, her i\u015fletim sistemini bir hashtable&#8217;da sayar ve daha sonra say\u0131s\u0131 1&#8217;den b\u00fcy\u00fck olanlar\u0131 filtreler.  Bu y\u00f6ntem, <code class=\"language-\">Group-Object<\/code> y\u00f6nteminden genellikle daha h\u0131zl\u0131d\u0131r.  Ayr\u0131ca, bu \u00f6rnekte,  <code class=\"language-\">.Split(\":\")[1]<\/code> ile i\u015fletim sistemini ay\u0131klamak i\u00e7in string manip\u00fclasyonu kullan\u0131yoruz.  Daha karma\u015f\u0131k veriler i\u00e7in, daha geli\u015fmi\u015f ayr\u0131\u015ft\u0131rma y\u00f6ntemleri gerekebilir.  [fatihsoysal.com](https:\/\/fatihsoysal.com) adresindeki blog yaz\u0131lar\u0131mda daha detayl\u0131 string manip\u00fclasyon tekniklerini bulabilirsiniz.<\/p>\n<p><strong>\u0130leri D\u00fczey: Performans Analizi ve Edge Case&#8217;ler<\/strong><\/p>\n<p>\u00c7ok b\u00fcy\u00fck dizilerle \u00e7al\u0131\u015f\u0131rken, performans kritik hale gelir.  Performans analizi i\u00e7in, <code class=\"language-\">Measure-Command<\/code> cmdlet&#8217;ini kullanabiliriz.  \u00d6rne\u011fin, <code class=\"language-\">Group-Object<\/code> ve hashtable y\u00f6ntemlerinin performans\u0131n\u0131 kar\u015f\u0131la\u015ft\u0131ral\u0131m:<\/p>\n<pre class=\"language-powershell\"><code># B\u00fcy\u00fck bir dizi olu\u015fturma\n$largeArray = 1..100000 | ForEach-Object {Get-Random -Minimum 1 -Maximum 1000}\n\n# Group-Object y\u00f6ntemi\nMeasure-Command {\n    $largeArray | Group-Object | Where-Object {$_.Count -gt 1}\n}\n\n# Hashtable y\u00f6ntemi\nMeasure-Command {\n    $count = @{}\n    $largeArray | ForEach-Object {\n        if ($count.ContainsKey($_)) { $count[$_]++ } else { $count[$_] = 1 }\n    }\n    $count.GetEnumerator() | Where-Object {$_.Value -gt 1}\n}<\/code><\/pre>\n<p>Bu kod, iki y\u00f6ntemin \u00e7al\u0131\u015fma s\u00fcresini \u00f6l\u00e7er.  Genellikle, hashtable y\u00f6ntemi daha h\u0131zl\u0131 olacakt\u0131r.<\/p>\n<p>Edge case&#8217;ler olarak, bo\u015f diziler veya sadece benzersiz de\u011ferler i\u00e7eren dizileri ele almal\u0131y\u0131z.  Bu durumlarda, kodumuzun hatas\u0131z \u00e7al\u0131\u015fmas\u0131n\u0131 sa\u011flamak \u00f6nemlidir.  \u00d6rne\u011fin, hashtable y\u00f6nteminde, bo\u015f bir dizi i\u00e7in <code class=\"language-\">$osCount<\/code> de\u011fi\u015fkeni bo\u015f olacakt\u0131r ve hi\u00e7bir hata vermeden \u00e7al\u0131\u015facakt\u0131r.<\/p>\n<p><strong>PowerShell&#8217;de Yinelenen De\u011ferleri Bulman\u0131n Di\u011fer Y\u00f6ntemleri<\/strong><\/p>\n<p><code class=\"language-\">Group-Object<\/code> ve Hashtable&#8217;\u0131n yan\u0131 s\u0131ra, PowerShell&#8217;de yinelenen de\u011ferleri bulmak i\u00e7in ba\u015fka y\u00f6ntemler de mevcuttur. \u00d6rne\u011fin,  <code class=\"language-\">ForEach-Object<\/code> ile birlikte <code class=\"language-\">-match<\/code> operat\u00f6r\u00fcn\u00fc kullanarak d\u00fczenli ifadelerle yinelenenleri bulabiliriz.  Ancak bu y\u00f6ntem,  karma\u015f\u0131k desenler i\u00e7in daha uygun olup,  basit yinelenen de\u011fer bulma i\u00e7in  <code class=\"language-\">Group-Object<\/code> veya Hashtable kadar verimli olmayabilir.<\/p>\n<p><strong>Uygulamada Yinelenen De\u011ferleri Ele Alma<\/strong><\/p>\n<p>Yinelenen de\u011ferleri bulman\u0131n yan\u0131 s\u0131ra, bunlar\u0131 nas\u0131l ele alaca\u011f\u0131m\u0131z da \u00f6nemlidir.  Yinelenen de\u011ferleri silmek, bunlar\u0131 bir listeye eklemek veya bunlara g\u00f6re farkl\u0131 i\u015flemler yapmak gerekebilir.  \u00d6rne\u011fin,  yinelenen sunucu isimlerini tespit ettikten sonra,  bu sunucular\u0131 bir raporlama sistemine ekleyebilir veya bunlar\u0131n yedeklemelerini kontrol edebiliriz.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>Bu makalede, PowerShell&#8217;de dizilerdeki yinelenen de\u011ferleri bulman\u0131n farkl\u0131 y\u00f6ntemlerini inceledik.  Basit y\u00f6ntemlerden ileri d\u00fczey performans optimizasyonlar\u0131na kadar \u00e7e\u015fitli teknikleri ele ald\u0131k.  Hashtable y\u00f6ntemi, \u00f6zellikle b\u00fcy\u00fck diziler i\u00e7in daha verimli bir \u00e7\u00f6z\u00fcm sunmaktad\u0131r.  Ancak, her y\u00f6ntemin kendi avantajlar\u0131 ve dezavantajlar\u0131 vard\u0131r ve en uygun y\u00f6ntem, verilerin yap\u0131s\u0131na ve uygulama gereksinimlerine ba\u011fl\u0131 olarak de\u011fi\u015fir.  Unutmay\u0131n ki, verimli kod yazmak, sadece do\u011fru algoritmay\u0131 se\u00e7mekle de\u011fil, ayn\u0131 zamanda kodun okunabilirli\u011fini ve s\u00fcrd\u00fcr\u00fclebilirli\u011fini de g\u00f6z \u00f6n\u00fcnde bulundurmakla ilgilidir.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong>Hangi y\u00f6ntem en h\u0131zl\u0131d\u0131r?<\/strong>  Genellikle, b\u00fcy\u00fck diziler i\u00e7in hashtable y\u00f6ntemi en h\u0131zl\u0131d\u0131r.<br \/>\n2. <strong>Bo\u015f bir dizi i\u00e7in kod nas\u0131l \u00e7al\u0131\u015f\u0131r?<\/strong>  Hashtable y\u00f6ntemi, bo\u015f bir dizi i\u00e7in hi\u00e7bir hata vermeden \u00e7al\u0131\u015f\u0131r.<br \/>\n3. <strong>Farkl\u0131 veri tiplerindeki diziler i\u00e7in bu y\u00f6ntemler \u00e7al\u0131\u015f\u0131r m\u0131?<\/strong>  Evet, bu y\u00f6ntemler farkl\u0131 veri tiplerindeki diziler i\u00e7in de \u00e7al\u0131\u015f\u0131r.<br \/>\n4. <strong>Yinelenen de\u011ferleri bulduktan sonra ne yapabilirim?<\/strong>  Yinelenen de\u011ferleri silmek, bir listeye eklemek veya bunlara g\u00f6re farkl\u0131 i\u015flemler yapmak gibi bir\u00e7ok se\u00e7enek mevcuttur.<br \/>\n5. <strong>Daha karma\u015f\u0131k veri yap\u0131lar\u0131 i\u00e7in nas\u0131l bir yakla\u015f\u0131m izlemeliyim?<\/strong>  Daha karma\u015f\u0131k veri yap\u0131lar\u0131 i\u00e7in,  nesne \u00f6zelliklerine g\u00f6re filtreleme ve gruplama gibi daha geli\u015fmi\u015f teknikler kullanman\u0131z gerekebilir.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PowerShell&#8217;de Dizilerde Yinelenen De\u011ferleri Bulma PowerShell ile \u00e7al\u0131\u015f\u0131rken, s\u0131kl\u0131kla b\u00fcy\u00fck veri k\u00fcmeleriyle u\u011fra\u015f\u0131r ve bu k\u00fcmeler i\u00e7inde&hellip;","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"csco_page_header_type":"","csco_page_load_nextpost":"","csco_page_subscribe_form":"","csco_page_contact_form":"","footnotes":""},"categories":[1319],"tags":[],"class_list":{"0":"post-28991","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-powershell","7":"cs-entry","8":"cs-video-wrap"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.5 (Yoast SEO v25.3.1) - 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