{"id":74,"date":"2012-10-22T20:30:52","date_gmt":"2012-10-22T20:30:52","guid":{"rendered":"http:\/\/www.linuxcloudvps.com\/blog\/?p=74"},"modified":"2018-01-31T08:56:44","modified_gmt":"2018-01-31T14:56:44","slug":"bash-array-find-the-first-missing-integer","status":"publish","type":"post","link":"https:\/\/www.linuxcloudvps.com\/blog\/bash-array-find-the-first-missing-integer\/","title":{"rendered":"Bash Array:  find the first missing integer"},"content":{"rendered":"<p>The script below will find the first missing number in an array of integers.<\/p>\n<p><!--more--><\/p>\n<pre class=\"brush: shell; gutter: true\">#!\/bin\/bash\r\narray=(100 101 102 105)\r\nfor (( i = 0 ; i &lt; $((${#array[@]}-1)) ; i++ )); do\r\nif [ $((${array[$i]}+1)) -ne ${array[$(($i + 1))]} ] ;then \r\n    M_NUMBER=&quot;$((${array[$i]}+1))&quot;\r\n    break\r\nfi\r\ndone\r\n\r\necho $M_NUMBER<\/pre>\n<p>Explaining the code:<\/p>\n<p>$((${#array[@]}-1)) &#8211; number of array elements minus one<\/p>\n<p>$((${array[$i]}+1)) &#8211; i-element of the array plus one, starting from the first element<\/p>\n<p>${array[$(($i + 1))]} &#8211; i+1 (next) element of the array, starting from the second element<\/p>\n<p>If the next element is not equal to previous element plus one, the script will print the missing number &#8211; $((${array[$i]}+1))<\/p>\n<p><span style=\"color: #ff0000;\"><strong>PS.<\/strong><\/span> If you liked this post please share it with your friends on the social networks using the buttons on the left or simply leave a reply below. Thanks.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The script below will find the first missing number in an array of integers.<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[17,21,132,18,19,20],"class_list":["post-74","post","type-post","status-publish","format-standard","hentry","category-scripts","tag-array","tag-bash","tag-linuxcloudvps","tag-missing-number","tag-script","tag-shell"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Bash Array: find the first missing integer | LinuxCloudVPS Blog<\/title>\n<meta name=\"description\" content=\"The script below will find the first missing number in an array of integers. #!\/bin\/bash array=(100 101 102 105) for (( i = 0 ; i &lt; $((${#array}-1)) ;\" \/>\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.linuxcloudvps.com\/blog\/bash-array-find-the-first-missing-integer\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Bash Array: find the first missing integer | LinuxCloudVPS Blog\" \/>\n<meta property=\"og:description\" content=\"The script below will find the first missing number in an array of integers. #!\/bin\/bash array=(100 101 102 105) for (( i = 0 ; 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