{"id":19994430,"date":"2025-06-10T09:37:00","date_gmt":"2025-06-10T07:37:00","guid":{"rendered":"https:\/\/www.shellrent.com\/blog\/?p=19991981"},"modified":"2025-06-10T09:37:49","modified_gmt":"2025-06-10T07:37:49","slug":"cose-e-come-eseguire-il-demone-cron","status":"publish","type":"post","link":"https:\/\/www.shellrent.com\/blog\/cose-e-come-eseguire-il-demone-cron\/","title":{"rendered":"Demone cron: cos\u2019\u00e8 e perch\u00e9 viene utilizzato"},"content":{"rendered":"\n<p>Il demone cron rappresenta uno degli strumenti pi\u00f9 datati e al contempo pi\u00f9 preziosi per gli amministratori di sistema. Concepito negli albori dell&#8217;informatica moderna, questo processo in background opera silenziosamente, fungendo da instancabile sentinella temporale capace di eseguire script e programmi a intervalli regolari e predefiniti.<\/p>\n\n\n\n<p>La sua capacit\u00e0 di automatizzare attivit\u00e0 ripetitive, dalla manutenzione routinaria del sistema all&#8217;esecuzione di backup notturni, ha reso cron un componente fondamentale nelle architetture server moderne, dove l&#8217;affidabilit\u00e0 e la precisione nella pianificazione delle operazioni rappresentano requisiti imprescindibili.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_80 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Indice dei contenuti:<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-6a03646fa2429\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #282828;color:#282828\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #282828;color:#282828\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-6a03646fa2429\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.shellrent.com\/blog\/cose-e-come-eseguire-il-demone-cron\/#Che_cose_un_demone\" >Che cos\u2019\u00e8 un demone?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.shellrent.com\/blog\/cose-e-come-eseguire-il-demone-cron\/#Crontab\" >Crontab<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.shellrent.com\/blog\/cose-e-come-eseguire-il-demone-cron\/#Cronjob_in_Linux\" >Cronjob in Linux<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Che_cose_un_demone\"><\/span><strong>Che cos\u2019\u00e8 un demone?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Un demone \u00e8 un programma eseguito in background utilizzato per effettuare determinate attivit\u00e0. <strong>Cron<\/strong>, come accennato, \u00e8 un demone, quindi un servizio che necessita esclusivamente dell\u2019avvio. Sulla maggior parte delle distribuzioni\u00a0<em>Linux,<\/em> viene installato di default e si avvia automaticamente dal sistema operativo.<\/p>\n\n\n\n<p>Cron&nbsp;pu\u00f2 gestire i comandi&nbsp;<em>jobs<\/em>&nbsp;in modo da eseguirli una sola volta, alla prima occorrenza della data\/ora prescelta, ma \u00e8 anche possibile far compiere ripetutamente i comandi; per esempio,&nbsp;nel caso in cui si voglia eseguire una determinata operazione ogni giorno e in uno specifico orario viene usato il&nbsp;<strong>crontab<\/strong>, i cui comandi mandati in esecuzione vengono chiamati&nbsp;<strong>cronjob<\/strong>.<\/p>\n\n\n\n<p>Nel contesto del sistema cron, \u00e8 infatti importante distinguere tra crontab e cronjob, spesso utilizzati in modo intercambiabile ma che rappresentano due concetti distinti.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Crontab\"><\/span><strong>Crontab<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>l crontab (contrazione di &#8220;cron table&#8221;) \u00e8 il file di configurazione che contiene l&#8217;elenco delle attivit\u00e0 programmate e le relative tempistiche di esecuzione per un determinato utente o per l&#8217;intero sistema. Ogni utente pu\u00f2 avere il proprio crontab personale, accessibile tramite il comando <em>crontab -e<\/em>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cronjob_in_Linux\"><\/span><strong>Cronjob in Linux<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Con i cronjob \u00e8 possibile far eseguire determinate procedure in uno specifico momento e usufruirne dai sistemi operativi (oltre Linux, anche Unix&nbsp;e OS) che prevedono il demone cron.<\/p>\n\n\n\n<p>Per impostare i comandi del cron, l\u2019ordine \u00e8 il seguente:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&#91;minuti]\u00a0&#91;ora]\u00a0&#91;giorno]\u00a0&#91;mese]\u00a0&#91;settimana]\u00a0&#91;utente] &#91;comando]<\/code><\/pre>\n\n\n\n<p>Ad esempio, se vuoi eseguire uno script ogni mattina alle 08.30, dovrai procedere nella seguente maniera:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code><strong>30 8 * * *\u00a0<\/strong>&#91;utente] &#91;comando].<\/code><\/pre>\n\n\n\n<p>L\u2019asterisco, detto anche&nbsp;<strong>wild card<\/strong>, pu\u00f2 essere usato come carattere jolly per rappresentare tutti i valori accettabili (ad esempio, un asterisco inserito come valore nel campo giorno, indica che tale comando deve essere eseguito tutti i giorni).<\/p>\n\n\n\n<p>Pi\u00f9 nel dettaglio, illustriamo in modo schematico i valori applicabili:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><td><\/td><td><strong>PARAMETRO<\/strong><\/td><td><strong>VALORE<\/strong><\/td><\/tr><\/thead><tbody><tr><td>1<\/td><td>Minuto<\/td><td>0-59<\/td><\/tr><tr><td>2<\/td><td>Ora<\/td><td>0-23<\/td><\/tr><tr><td>3<\/td><td>Giorno del mese<\/td><td>1-31<\/td><\/tr><tr><td>4<\/td><td>Mese<\/td><td>1-12<\/td><\/tr><tr><td>5<\/td><td>Giorno della settimana<\/td><td>0-6<\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Il demone cron rappresenta uno degli strumenti pi\u00f9 datati e al contempo pi\u00f9 preziosi per gli amministratori di sistema. Concepito negli albori&#8230;<\/p>\n","protected":false},"author":19,"featured_media":199947875,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[36],"tags":[],"class_list":{"0":"post-19994430","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-hosting"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Demone cron: cos\u2019\u00e8 e perch\u00e9 viene utilizzato<\/title>\n<meta name=\"description\" content=\"Il demone cron aiuta ad automatizzare attivit\u00e0 ripetitive. 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