{"id":4257,"date":"2020-10-30T21:24:57","date_gmt":"2020-10-30T20:24:57","guid":{"rendered":"https:\/\/webhosting.de\/?p=4257"},"modified":"2020-10-30T21:24:57","modified_gmt":"2020-10-30T20:24:57","slug":"perl-practical-extraction-and-report-language","status":"publish","type":"post","link":"https:\/\/webhosting.de\/da\/perl-practical-extraction-and-report-language\/","title":{"rendered":"Perl"},"content":{"rendered":"<p>Programm\u00f8ren og forfatteren af Perl, som er s\u00e5 vigtig i dag, er Larry Wall. Han ledte efter en l\u00f8sning, der kunne g\u00f8re sprogkommandoerne til programmeringskommandoer lettere. Dette viser sig i nemme s\u00f8ge- og erstatningsoperationer, som udf\u00f8res i editoren. Perl er en syntese af programmeringssproget C og UNIX-funktionerne sed og awk. Dermed blev verden af programmeringssprog gjort lettere.<\/p>\n<h2>Hvad er Perl?<\/h2>\n<p>Alle programmer, der skrives med Perl-programmet, gemmes som ASCII-filer. Dette svarer til et shell-script. Disse filer overs\u00e6ttes derefter f\u00f8r den f\u00f8rste udf\u00f8relse. Programmerne kan s\u00e5ledes nemt redigeres og samtidig overf\u00f8res til andre computere. Perl tilbyder en h\u00f8j hastighed for s\u00f8gefunktioner. I henhold til den kunstneriske licens under GPL (GNU Public License) er Perl med kildekoder inkluderet frit tilg\u00e6ngeligt for alle. P\u00e5 nogle computere med UIX eller <a href=\"https:\/\/webhosting.de\/da\/windows-vs-linux-hosting-a-comparison-of-advantages-and-disadvantages\/\">Linux-system<\/a> programmet er allerede forudinstalleret. Perl kan findes under stien \/usr\/local\/bin\/perl eller under den anden sti \/usr\/bin\/perl. Visse porte er ogs\u00e5 inkluderet til styresystemerne IOS til Macbooks eller endda til Windows. Alle funktionerne er dog kun tilg\u00e6ngelige for ikke-UNIX-systemer. 2012-staten har lanceret den stabile version Perl 5.12.2. For at finde ud af nummeret p\u00e5 den installerede version af Perl, som findes p\u00e5 computeren, kan du finde det p\u00e5 \"perl-v\". Nogle ting kan allerede betragtes som for\u00e6ldede, da vejledningen er skrevet ud fra Perl 5.005 eller Perl 5.6.0. Men alle Perl-versioner k\u00f8rer p\u00e5 nyere versioner af Perl-fortolkere p\u00e5 grund af deres kompatibilitet.<\/p>\n<h3>Perl- Det nye program- Hvordan fungerer det?<\/h3>\n<p>Programmet skrives i en teksteditor og gemmes som en tekstfil. Perl virker ikke i en teksteditor, fordi <a href=\"https:\/\/webhosting.de\/da\/die-5-elemente-einer-guten-landing-page\/\">Tekst<\/a> filen er gemt i ASCII-kode. I UNIX- og Linux-operativsystemer skal du v\u00e6re opm\u00e6rksom p\u00e5, at execute-bitten er sat i filen. Dette giver dig mulighed for at kalde Perl-programmerne direkte. Det fungerer med chmod u+x skript.pl. P\u00e5 kommandolinjen kaldes perl skript.pl. En anden mulighed er at indtaste skript.pl p\u00e5 kommandolinjen. S\u00e5 hvis der er problemer med den f\u00f8rste sti, f.eks. hvis der ikke s\u00f8ges efter eksekverbare programmer, er den anden sti altid en succes. Den f\u00f8rste linje, der vises, begynder altid med en hash, dvs. #. Denne hash skal noteres som en kommentar af Perl, ellers har den ingen funktion. Denne f\u00f8rste linje g\u00e6lder for <a href=\"https:\/\/webhosting.de\/da\/aws-cloud-erhaelt-shell-zugriff-per-browser\/\">Shell<\/a> for at vise, at det er perl-programmet og ikke shell-scriptet. Stien viser, hvor perl blev installeret i systemet. Det er altid tilr\u00e5deligt at angive et -w i stien, da dette giver mulighed for omfattende meddelelser. Den sidste linje viser udskriftsfunktionen. Denne funktion viser en tegnstreng, som udskrives p\u00e5 sk\u00e6rmen. Kommandoer skal altid afsluttes med et semikolon \";\". Funktionsnavne skal v\u00e6re store og sm\u00e5, ellers opst\u00e5r der en fejlkode. Du kan ogs\u00e5 inds\u00e6tte et vilk\u00e5rligt antal tabulatorer og linjef\u00f8dninger p\u00e5 enhver position, hvor der kan placeres et mellemrum. Bem\u00e6rkninger skal m\u00e6rkes #. Disse g\u00e6lder indtil slutningen af linjen.<\/p>\n<h3>Navn og forskellige versioner<\/h3>\n<p>Navnet p\u00e5 programmet stammer fra Bibelen. Jesus \u00f8nsker at beskrive himmeriges rige ved hj\u00e6lp af billedet af en k\u00f8bmand. Han \u00f8nsker at s\u00e6lge sine ejendele for at k\u00f8be en perle. Inden den f\u00f8rste udgivelse blev navnet Peal \u00e6ndret til Perl, fordi der allerede fandtes et program kaldet PEARL. Perl henviser til sproget og perl til sproget. Perl-f\u00e6llesskabet l\u00e6gger stor v\u00e6gt p\u00e5, at stavem\u00e5den PERL ikke anvendes. I mellemtiden findes der forskellige versioner af programmet. Perl 1 blev udgivet den 18. december 1987 og var en mere kraftfuld shell. Version 2.0 blev frigivet den 5. juni 1987 og var blevet grundigt omskrevet. Regex-motoren blev udvidet og forbedret. Den 18. oktober 1989 fulgte Perl 3-versionen. Dette kan s\u00e5 bruges med bin\u00e6re <a href=\"https:\/\/webhosting.de\/da\/personenbezogene-daten-sozialen-netzwerken\/\">Data<\/a> og skrive netv\u00e6rksprogrammering. Dette blev fulgt op af Perl 4 den 21.03.1991. Denne blev redigeret og udviklet af forskellige programm\u00f8rer indtil 4.036 blev n\u00e5et. Larry Wall programmerede derefter Perl 5 i 1993. Denne version blev offentliggjort den 18.10.1994. Formateret dokumentation kan nu inds\u00e6ttes som kildekode. Perl 5 blev derefter ogs\u00e5 porteret til Windows og Macintosh. Perl 5.6 var i stand til at h\u00e5ndtere Unicodes og UTF-8 den 22.03.2000. Efter version 5.22 er den nuv\u00e6rende version nu Perl 6.<\/p>","protected":false},"excerpt":{"rendered":"<p>Der Programmierer und Autor des heute so wichtigen Programms Perl ist Larry Wall. Dieser hat eine L\u00f6sung gesucht, die die Sprachbefehle f\u00fcr Programmierbefehle einfacher macht. Dieses \u00e4u\u00dfert sich in leichten Such- und Ersetzungsoperationen, wie auf dem Editor ausgef\u00fchrt werden. Perl ist eine Synthese von der Programmiersprache C und den UNIX- Eigenschaften sed und awk. 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