{"id":1531,"date":"2020-08-13T07:00:00","date_gmt":"2020-08-13T04:00:00","guid":{"rendered":"https:\/\/www.dataplatform.gr\/?p=1531"},"modified":"2026-03-23T17:33:59","modified_gmt":"2026-03-23T14:33:59","slug":"pos-mporo-na-programmatiso-aytomates","status":"publish","type":"post","link":"https:\/\/www.dataplatform.gr\/en\/pos-mporo-na-programmatiso-aytomates\/","title":{"rendered":"How can we schedule automatic tasks in Unix"},"content":{"rendered":"<p>Unix-based operating systems such as Linux and MacOS have the Cron program installed. <\/p>\n\n\n\n<p>Cron allows us to schedule tasks to run automatically over time.<\/p>\n\n\n\n<p>Its usefulness stands out in repetitive tasks.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">The editorial<\/h2>\n\n\n\n<h6 class=\"wp-block-heading\">To see the list of all the schedules we already have in cron<\/h6>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\" data-no-translation=\"\" data-no-auto-translation=\"\">crontab \u2013l <\/pre>\n\n\n\n<h6 class=\"wp-block-heading\">To add new schedules or change existing ones<\/h6>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\" data-no-translation=\"\" data-no-auto-translation=\"\">crontab \u2013e <\/pre>\n\n\n\n<p>Each entry is a separate program. <\/p>\n\n\n\n<h5 class=\"wp-block-heading\">The way it is drafted<\/h5>\n\n\n\n<pre class=\"wp-block-code\" data-no-translation=\"\" data-no-auto-translation=\"\"><code># \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 \u03bb\u03b5\u03c0\u03c4\u03cc (0 - 59)\n# \u2502 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 \u03ce\u03c1\u03b1 (0 - 23)\n# \u2502 \u2502 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 \u03bc\u03ad\u03c1\u03b1 (1 - 31)\n# \u2502 \u2502 \u2502 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 \u03bc\u03ae\u03bd\u03b1\u03c2 (1 - 12)\n# \u2502 \u2502 \u2502 \u2502 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 \u03b7\u03bc\u03ad\u03c1\u03b1 \u03c4\u03b7\u03c2 \u03b5\u03b2\u03b4\u03bf\u03bc\u03ac\u03b4\u03b1\u03c2 (0 - 6) (0 \u03b5\u03af\u03bd\u03b1\u03b9 \u03b7 \u039a\u03c5\u03c1\u03b9\u03b1\u03ba\u03ae)\n# \u2502 \u2502 \u2502 \u2502 \u2502                                  \n# \u2502 \u2502 \u2502 \u2502 \u2502\n# \u2502 \u2502 \u2502 \u2502 \u2502\n# * * * * * &lt;\u03b7 \u03b5\u03bd\u03c4\u03bf\u03bb\u03ae \u03c0\u03bf\u03c5 \u03b8\u03b1 \u03b5\u03ba\u03c4\u03b5\u03bb\u03b5\u03c3\u03c4\u03b5\u03af&gt;<\/code><\/pre>\n\n\n\n<p>The order in the asterisks is minutes 0-59, hours 0-23, day 1-31, month 1-12, day of the week 0-6 with 0 being Sunday to begin with. However we can select some days by putting &#039; , &#039; between the days.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Examples<\/h2>\n\n\n\n<p>To run the test.sh file<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">Every 5 minutes<\/h6>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\" data-no-translation=\"\" data-no-auto-translation=\"\">*\/5 * * * * \/home\/user\/test.sh<\/pre>\n\n\n\n<h6 class=\"wp-block-heading\">Every hour<\/h6>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\" data-no-translation=\"\" data-no-auto-translation=\"\">0 * * * * \/home\/user\/test.sh<\/pre>\n\n\n\n<h6 class=\"wp-block-heading\">At 10 in the morning<\/h6>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\" data-no-translation=\"\" data-no-auto-translation=\"\">0 10 * * * \/home\/user\/test.sh<\/pre>\n\n\n\n<h6 class=\"wp-block-heading\">Every Monday at 10:15 am<\/h6>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\" data-no-translation=\"\" data-no-auto-translation=\"\">15 10 * * 1 \/home\/user\/test.sh<\/pre>\n\n\n\n<h6 class=\"wp-block-heading\">Every first and 15th of the month at 8 am<\/h6>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\" data-no-translation=\"\" data-no-auto-translation=\"\">0 8 1,15 * * \/home\/user\/test.sh<\/pre>\n\n\n\n<h5 class=\"wp-block-heading\">To see the log<\/h5>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\" data-no-translation=\"\" data-no-auto-translation=\"\">tail -f \/var\/spool\/mail\/onoma_xristi<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Sources:<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Cron\" target=\"_blank\" rel=\"noreferrer noopener\">Cron Wiki<\/a><\/li>\n<\/ul>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>Unix-based operating systems such as Linux and MacOS have the Cron program installed. Cron allows us to schedule tasks to run automatically over time. Its usefulness stands out in repetitive tasks. The editor To see the list of all the schedules we already have in cron To [...]<\/p>","protected":false},"author":1,"featured_media":696,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[34],"tags":[72,75,73,74],"class_list":["post-1531","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-unix","tag-cron","tag-linux","tag-scheduling","tag-tasks"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u03a0\u03ce\u03c2 \u03bc\u03c0\u03bf\u03c1\u03bf\u03cd\u03bc\u03b5 \u03bd\u03b1 \u03c0\u03c1\u03bf\u03b3\u03c1\u03b1\u03bc\u03bc\u03b1\u03c4\u03af\u03c3\u03bf\u03c5\u03bc\u03b5 \u03b1\u03c5\u03c4\u03cc\u03bc\u03b1\u03c4\u03b5\u03c2 \u03b5\u03c1\u03b3\u03b1\u03c3\u03af\u03b5\u03c2 \u03c3\u03c4\u03bf Unix - DataPlatform.gr<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.dataplatform.gr\/en\/pos-mporo-na-programmatiso-aytomates\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u03a0\u03ce\u03c2 \u03bc\u03c0\u03bf\u03c1\u03bf\u03cd\u03bc\u03b5 \u03bd\u03b1 \u03c0\u03c1\u03bf\u03b3\u03c1\u03b1\u03bc\u03bc\u03b1\u03c4\u03af\u03c3\u03bf\u03c5\u03bc\u03b5 \u03b1\u03c5\u03c4\u03cc\u03bc\u03b1\u03c4\u03b5\u03c2 \u03b5\u03c1\u03b3\u03b1\u03c3\u03af\u03b5\u03c2 \u03c3\u03c4\u03bf Unix - DataPlatform.gr\" \/>\n<meta property=\"og:description\" content=\"\u03a3\u03c4\u03b1 \u03bb\u03b5\u03b9\u03c4\u03bf\u03c5\u03c1\u03b3\u03b9\u03ba\u03ac \u03c3\u03c5\u03c3\u03c4\u03ae\u03bc\u03b1\u03c4\u03b1 \u03b2\u03b1\u03c3\u03b9\u03c3\u03bc\u03ad\u03bd\u03b1 \u03c3\u03b5 Unix \u03cc\u03c0\u03c9\u03c2 Linux \u03ba\u03b1\u03b9 MacOS \u03ad\u03c7\u03bf\u03c5\u03bc\u03b5 \u03b5\u03b3\u03ba\u03b1\u03c4\u03b1\u03c3\u03c4\u03b7\u03bc\u03ad\u03bd\u03bf \u03c4\u03bf \u03c0\u03c1\u03cc\u03b3\u03c1\u03b1\u03bc\u03bc\u03b1 Cron. To Cron \u03bc\u03b1\u03c2 \u03b4\u03af\u03bd\u03b5\u03b9 \u03c4\u03b7\u03bd \u03b4\u03c5\u03bd\u03b1\u03c4\u03cc\u03c4\u03b7\u03c4\u03b1 \u03bd\u03b1 \u03bc\u03c0\u03bf\u03c1\u03bf\u03cd\u03bc\u03b5 \u03bd\u03b1 \u03c0\u03c1\u03bf\u03b3\u03c1\u03b1\u03bc\u03bc\u03b1\u03c4\u03af\u03c3\u03bf\u03c5\u03bc\u03b5 \u03b5\u03c1\u03b3\u03b1\u03c3\u03af\u03b5\u03c2 \u03bd\u03b1 \u03b5\u03ba\u03c4\u03b5\u03bb\u03bf\u03cd\u03bd\u03c4\u03b1\u03b9 \u03b1\u03c5\u03c4\u03cc\u03bc\u03b1\u03c4\u03b1 \u03bc\u03ad\u03c3\u03b1 \u03c3\u03c4\u03bf \u03c7\u03c1\u03cc\u03bd\u03bf. \u0397 \u03c7\u03c1\u03b7\u03c3\u03b9\u03bc\u03cc\u03c4\u03b7\u03c4\u03b1 \u03c4\u03bf\u03c5 \u03be\u03b5\u03c7\u03c9\u03c1\u03af\u03b6\u03b5\u03b9 \u03c3\u03b5 \u03b5\u03c1\u03b3\u03b1\u03c3\u03af\u03b5\u03c2 \u03c0\u03bf\u03c5 \u03b5\u03c0\u03b1\u03bd\u03b1\u03bb\u03b1\u03bc\u03b2\u03ac\u03bd\u03bf\u03bd\u03c4\u03b1\u03b9. \u03a4\u03bf \u03c3\u03c5\u03bd\u03c4\u03b1\u03ba\u03c4\u03b9\u03ba\u03cc \u0393\u03b9\u03b1 \u03bd\u03b1 \u03b4\u03bf\u03cd\u03bc\u03b5 \u03c4\u03b7 \u03bb\u03af\u03c3\u03c4\u03b1 \u03bc\u03b5 \u03cc\u03c3\u03bf\u03c5\u03c2 \u03c0\u03c1\u03bf\u03b3\u03c1\u03b1\u03bc\u03bc\u03b1\u03c4\u03b9\u03c3\u03bc\u03bf\u03cd\u03c2 \u03ad\u03c7\u03bf\u03c5\u03bc\u03b5 \u03ae\u03b4\u03b7 \u03c3\u03c4\u03bf cron \u0393\u03b9\u03b1 [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.dataplatform.gr\/en\/pos-mporo-na-programmatiso-aytomates\/\" \/>\n<meta property=\"og:site_name\" content=\"DataPlatform.gr\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/dataplatform.gr\/\" \/>\n<meta property=\"article:published_time\" content=\"2020-08-13T04:00:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-03-23T14:33:59+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.dataplatform.gr\/wp-content\/uploads\/2020\/06\/dp_linux.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"720\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Stratos Matzouranis\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Stratos Matzouranis\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.dataplatform.gr\\\/pos-mporo-na-programmatiso-aytomates\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.dataplatform.gr\\\/pos-mporo-na-programmatiso-aytomates\\\/\"},\"author\":{\"name\":\"Stratos Matzouranis\",\"@id\":\"https:\\\/\\\/www.dataplatform.gr\\\/#\\\/schema\\\/person\\\/e87bf4fd02b65cb6aa0942f87245bbaf\"},\"headline\":\"\u03a0\u03ce\u03c2 \u03bc\u03c0\u03bf\u03c1\u03bf\u03cd\u03bc\u03b5 \u03bd\u03b1 \u03c0\u03c1\u03bf\u03b3\u03c1\u03b1\u03bc\u03bc\u03b1\u03c4\u03af\u03c3\u03bf\u03c5\u03bc\u03b5 \u03b1\u03c5\u03c4\u03cc\u03bc\u03b1\u03c4\u03b5\u03c2 \u03b5\u03c1\u03b3\u03b1\u03c3\u03af\u03b5\u03c2 \u03c3\u03c4\u03bf Unix\",\"datePublished\":\"2020-08-13T04:00:00+00:00\",\"dateModified\":\"2026-03-23T14:33:59+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.dataplatform.gr\\\/pos-mporo-na-programmatiso-aytomates\\\/\"},\"wordCount\":18,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.dataplatform.gr\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.dataplatform.gr\\\/pos-mporo-na-programmatiso-aytomates\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.dataplatform.gr\\\/wp-content\\\/uploads\\\/2020\\\/06\\\/dp_linux.png\",\"keywords\":[\"Cron\",\"Linux\",\"Scheduling\",\"Tasks\"],\"articleSection\":[\"Unix\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.dataplatform.gr\\\/pos-mporo-na-programmatiso-aytomates\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.dataplatform.gr\\\/pos-mporo-na-programmatiso-aytomates\\\/\",\"url\":\"https:\\\/\\\/www.dataplatform.gr\\\/pos-mporo-na-programmatiso-aytomates\\\/\",\"name\":\"\u03a0\u03ce\u03c2 \u03bc\u03c0\u03bf\u03c1\u03bf\u03cd\u03bc\u03b5 \u03bd\u03b1 \u03c0\u03c1\u03bf\u03b3\u03c1\u03b1\u03bc\u03bc\u03b1\u03c4\u03af\u03c3\u03bf\u03c5\u03bc\u03b5 \u03b1\u03c5\u03c4\u03cc\u03bc\u03b1\u03c4\u03b5\u03c2 \u03b5\u03c1\u03b3\u03b1\u03c3\u03af\u03b5\u03c2 \u03c3\u03c4\u03bf Unix - 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