{"id":54718,"date":"2020-01-02T00:00:00","date_gmt":"2020-01-01T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/unix-ispolnilos-50-let-chto-eto-znachit"},"modified":"2020-02-18T14:02:46","modified_gmt":"2020-02-18T11:02:46","slug":"unix-ispolnilos-50-let-chto-eto-znachit","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/unix-ispolnilos-50-let-chto-eto-znachit","title":{"rendered":"Unix ha compiuto 50 anni. Cosa significa questo?","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Il 2020 \u00e8 un anno significativo per Unix: all'inizio dell'anno il sistema operativo originale ha compiuto 50 anni. Il tempo Unix, noto anche come \u00abdata epoch\u00bb, \u00e8 il numero di secondi trascorsi dal 1 gennaio 1970. Ma cosa preoccupa gli sviluppatori del kernel in occasione del cinquantesimo anniversario di Unix?<\/p>\n<p><img decoding=\"async\" alt=\"Unix ha compiuto 50 anni. Cosa significa questo?\" src=\"\/wp-content\/uploads\/2020\/01\/1b3a3bdeb0400f3b34d5cd6964a48010.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Sebbene alcuni degli sviluppi iniziali di Unix precedano l'inizio ufficiale della sua \u00abepoca\u00bb, il 1 gennaio 1970 rimane il punto zero nel tempo POSIX. Pertanto, con l'inizio del 1 gennaio 2020, la piattaforma ha ufficialmente compiuto esattamente 50 anni.<\/p>\n<p><strong>Tempo <\/strong><strong>Unix contro il tempo umano<\/strong><\/p>\n<p>Dal punto di vista umano, 50 anni \u00e8 un lungo periodo. Dal punto di vista del tempo Unix, non c'\u00e8 nulla di particolare nel raggiungere i 50 anni, e anche 43 anni sarebbero stati significativi. I sistemi Unix (incluso Linux) memorizzano i valori di data e ora come il numero di secondi trascorsi dal 1970-01-01 00:00:00 UTC, usando una registrazione a 32 bit. Per determinare quanti secondi sono trascorsi da quel momento e quindi il valore attuale del tempo Unix, si pu\u00f2 eseguire il comando:<\/p>\n<p><center><\/center><\/p>\n<p>$ date +%s<\/p>\n<p>1576883876<\/p>\n<p>L'argomento %s dopo il comando date definisce la visualizzazione della data e dell'ora attuale come numero di secondi dall'inizio del 1970-01-01.<\/p>\n<p><img decoding=\"async\" alt=\"Unix ha compiuto 50 anni. Cosa significa questo?\" src=\"\/wp-content\/uploads\/2020\/01\/aba69e769edb987923b060b6e32f9a00.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><strong>Qual \u00e8 la data massima che i sistemi possono memorizzare <\/strong><strong>Unix?<\/strong><\/p>\n<p>Per capire quanto tempo pu\u00f2 contenere un sistema Unix, \u00e8 necessario valutare la capacit\u00e0 di un campo a 32 bit. Si pu\u00f2 calcolare cos\u00ec:<\/p>\n<p>$ echo '2^32' | bc<\/p>\n<p>4294967296<\/p>\n<p>Tuttavia, poich\u00e9 Unix prevede la memorizzazione di numeri negativi, un bit viene riservato per il segno, riducendo cos\u00ec il valore del tempo a:<\/p>\n<p>$ echo '2^31' | bc<\/p>\n<p>2147483648<\/p>\n<p>E poich\u00e9 la numerazione Unix inizia da 0, ci\u00f2 significa che abbiamo 2.147.483.648 valori, ma il massimo \u00e8 2.147.483&nbsp;647: il valore della data e dell'ora Unix non pu\u00f2 superare questo numero. Proprio come il contachilometri di un'auto non pu\u00f2 mostrare pi\u00f9 di 999.999 chilometri: aggiungi 1 e il valore si azzera.<\/p>\n<p><strong>Quanto dura un anno in secondi?<\/strong><\/p>\n<p>Il numero di secondi in un anno pu\u00f2 essere calcolato nel seguente modo:<\/p>\n<p>$ expr 24 * 60 * 60 * 365<\/p>\n<p>31536000<\/p>\n<p>In un anno bisestile si aggiunge un giorno in pi\u00f9:<\/p>\n<p>$ expr 24 * 60 * 60 * 366<\/p>\n<p>31622400<\/p>\n<p><img decoding=\"async\" alt=\"Unix ha compiuto 50 anni. Cosa significa questo?\" src=\"\/wp-content\/uploads\/2020\/01\/a720be1bfca58df09540785bf66f556d.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><strong>Come visualizza Unix il suo 50\u00b0 compleanno?<\/strong><\/p>\n<p>Il 1\u00b0 gennaio 2020 alle 12:00, il tempo sar\u00e0 1577836800. Il calcolo \u00e8 complicato perch\u00e9 bisogna considerare gli anni bisestili. Dall'inizio dell'era Unix ci sono stati 12 di questi anni, dal 1972 al 2016. Ci\u00f2 significa che sono trascorsi 38 anni normali.<\/p>\n<p>Ecco come appare il comando expr per calcolare i secondi trascorsi negli ultimi 50 anni:<\/p>\n<p>$ expr 24 * 60 * 60 * 365 * 38 + 24 * 60 * 60 * 366 * 12<\/p>\n<p>1577836800<\/p>\n<p>Oppure in questo modo, tenendo conto dei calcoli effettuati in precedenza:<\/p>\n<p>$ expr 31536000 * 38 + 31622400 * 12<\/p>\n<p>1577836800<\/p>\n<p>Questo modo di registrare il tempo ha reso i sistemi Unix immuni al problema Y2K, che ha preoccupato le persone alla fine del 1999, temendo che il passaggio al 2000 potesse danneggiare i sistemi informatici. Le difficolt\u00e0 si sono rivelate molto inferiori alle aspettative. Infatti, solo le applicazioni che registravano gli anni in formato a due cifre hanno affrontato il problema del reset delle date. Molti sviluppatori hanno fatto lavoro aggiuntivo per garantire che le loro applicazioni non fossero colpite dal problema Y2K.<\/p>\n<p><strong>Quando il tempo <\/strong><strong>Unix avr\u00e0 problemi?<\/strong><\/p>\n<p>Difficult\u00e0 simili si prevedono per i sistemi Unix non prima del 2038, quando le date memorizzate nel formato descritto sopra supereranno lo spazio a 32 bit. Rimangono ancora 18 anni, ma gli sviluppatori del kernel stanno gi\u00e0 lavorando per evitare futuri malfunzionamenti.<\/p>\n<p>Il problema del 2038 \u00e8 talvolta chiamato problema Y2K38. Se non verr\u00e0 risolto entro marted\u00ec 19 gennaio 2038, dopo questa data i sistemi potrebbero pensare che sia arrivato l'anno 1901. Uno dei modi per affrontare questo problema \u00e8 passare a una rappresentazione delle informazioni su data e ora a 64 bit. Alcuni sostengono che ci\u00f2 sar\u00e0 molto pi\u00f9 complicato di quanto possa sembrare.<\/p>\n<p style=\"text-align: center;\"><center><center><iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/gfycat.com\/ifr\/SereneGorgeousIcelandichorse\" frameborder=\"0\" allowfullscreen><\/iframe><\/center><\/center><\/p>\n<p>In ogni caso, non c'\u00e8 motivo di farsi prendere dal panico. Ci\u00f2 che \u00e8 davvero importante oggi \u00e8 il 50\u00b0 anniversario dei sistemi Unix, considerati uno dei sistemi operativi pi\u00f9 significativi della storia.<\/p>\n<p><center><\/p>\n<p><\/center><\/p>\n<p>\t\t\t\t<center><br \/>\n\t\t\t\t\t\t\t\t<\/center><br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"http:\/\/www.3dnews.ru\/1000521\">3dnews.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>2020 \u0433\u043e\u0434 \u0437\u043d\u0430\u043c\u0435\u043d\u0430\u0442\u0435\u043b\u0435\u043d \u0434\u043b\u044f Unix: \u0432 \u0441\u0430\u043c\u043e\u043c \u043d\u0430\u0447\u0430\u043b\u0435 \u0433\u043e\u0434\u0430 \u043e\u0440\u0438\u0433\u0438\u043d\u0430\u043b\u044c\u043d\u043e\u0439 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u0438\u0441\u043f\u043e\u043b\u043d\u0438\u043b\u043e\u0441\u044c 50 \u043b\u0435\u0442. \u0412\u0440\u0435\u043c\u044f Unix, \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u043e\u0435 \u0442\u0430\u043a\u0436\u0435 \u043a\u0430\u043a &laquo;\u0434\u0430\u0442\u044b \u044d\u043f\u043e\u0445\u0438&raquo;, &mdash; \u044d\u0442\u043e \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u0441\u0435\u043a\u0443\u043d\u0434, \u043f\u0440\u043e\u0448\u0435\u0434\u0448\u0438\u0445 \u0441 1 \u044f\u043d\u0432\u0430\u0440\u044f 1970 \u0433\u043e\u0434\u0430. \u041d\u043e \u0447\u0442\u043e \u0436\u0435 \u0431\u0435\u0441\u043f\u043e\u043a\u043e\u0438\u0442 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u0432 \u044f\u0434\u0440\u0430 \u0432 \u0441\u0432\u044f\u0437\u0438 \u0441 \u043f\u043e\u043b\u0443\u0432\u0435\u043a\u043e\u0432\u044b\u043c \u044e\u0431\u0438\u043b\u0435\u0435\u043c Unix? \u0425\u043e\u0442\u044f \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0438\u0437 \u0440\u0430\u043d\u043d\u0438\u0445 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043e\u043a Unix \u043f\u0440\u0435\u0434\u0448\u0435\u0441\u0442\u0432\u0443\u044e\u0442 \u043e\u0444\u0438\u0446\u0438\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043d\u0430\u0447\u0430\u043b\u0443 \u0435\u0433\u043e &laquo;\u044d\u043f\u043e\u0445\u0438&raquo;, [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-54718","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"2020 \u0433\u043e\u0434 \u0437\u043d\u0430\u043c\u0435\u043d\u0430\u0442\u0435\u043b\u0435\u043d \u0434\u043b\u044f Unix: \u0432 \u0441\u0430\u043c\u043e\u043c \u043d\u0430\u0447\u0430\u043b\u0435 \u0433\u043e\u0434\u0430 \u043e\u0440\u0438\u0433\u0438\u043d\u0430\u043b\u044c\u043d\u043e\u0439 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u0438\u0441\u043f\u043e\u043b\u043d\u0438\u043b\u043e\u0441\u044c 50 \u043b\u0435\u0442. \u0412\u0440\u0435\u043c\u044f Unix, \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u043e\u0435 \u0442\u0430\u043a\u0436\u0435 \u043a\u0430\u043a \u00ab\u0434\u0430\u0442\u044b \u044d\u043f\u043e\u0445\u0438\u00bb, \u2014 \u044d\u0442\u043e \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u0441\u0435\u043a\u0443\u043d\u0434, \u043f\u0440\u043e\u0448\u0435\u0434\u0448\u0438\u0445 \u0441 1 \u044f\u043d\u0432\u0430\u0440\u044f 1970 \u0433\u043e\u0434\u0430.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/unix-ispolnilos-50-let-chto-eto-znachit\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.0.1\" \/>\n\t\t<meta property=\"og:locale\" content=\"it_IT\" \/>\n\t\t<meta property=\"og:site_name\" content=\"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"\ud83e\udd47Unix \u0438\u0441\u043f\u043e\u043b\u043d\u0438\u043b\u043e\u0441\u044c 50 \u043b\u0435\u0442. \u0427\u0442\u043e \u044d\u0442\u043e \u0437\u043d\u0430\u0447\u0438\u0442? 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Il tempo Unix, noto anche come \"data epoch\", \u00e8 il numero di secondi trascorsi dal 1 gennaio 1970.","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/unix-ispolnilos-50-let-chto-eto-znachit","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"it_IT","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47Unix \u0438\u0441\u043f\u043e\u043b\u043d\u0438\u043b\u043e\u0441\u044c 50 \u043b\u0435\u0442. \u0427\u0442\u043e \u044d\u0442\u043e \u0437\u043d\u0430\u0447\u0438\u0442? | ProHoster","og:description":"2020 \u0433\u043e\u0434 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