{"id":117,"date":"2008-09-24T10:14:09","date_gmt":"2008-09-24T10:14:09","guid":{"rendered":"https:\/\/fir3netwp.gmsrrpobkbd.com\/2008\/09\/24\/sed-by-example\/"},"modified":"2021-07-31T16:57:15","modified_gmt":"2021-07-31T16:57:15","slug":"sed-by-example","status":"publish","type":"post","link":"https:\/\/www.fir3net.com\/UNIX\/General-unix\/sed-by-example.html","title":{"rendered":"Common Sed Examples"},"content":{"rendered":"<p>Below are some of the common uses and commands for sed that I have come across over the years,<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_65 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-662f4171ab692\" 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: #999;color:#999\" 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: #999;color:#999\" 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-662f4171ab692\"  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.fir3net.com\/UNIX\/General-unix\/sed-by-example.html\/#Find_and_Replace\" title=\"Find and Replace \">Find and Replace <\/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.fir3net.com\/UNIX\/General-unix\/sed-by-example.html\/#Find_and_Delete\" title=\"Find and Delete\">Find and Delete<\/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.fir3net.com\/UNIX\/General-unix\/sed-by-example.html\/#Remove_Multiple_words\" title=\"Remove Multiple words\">Remove Multiple words<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.fir3net.com\/UNIX\/General-unix\/sed-by-example.html\/#Change_the_first_instance_on_each_line\" title=\"Change the first instance on each line \">Change the first instance on each line <\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.fir3net.com\/UNIX\/General-unix\/sed-by-example.html\/#Change_case\" title=\" Change case\"> Change case<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.fir3net.com\/UNIX\/General-unix\/sed-by-example.html\/#Changing_multiple_files\" title=\"Changing multiple files\">Changing multiple files<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.fir3net.com\/UNIX\/General-unix\/sed-by-example.html\/#Insert_Line\" title=\"Insert Line\">Insert Line<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.fir3net.com\/UNIX\/General-unix\/sed-by-example.html\/#Remove_4_digits\" title=\"Remove 4 digits \n\">Remove 4 digits \n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.fir3net.com\/UNIX\/General-unix\/sed-by-example.html\/#String_SUB_Line_contains_X_but_not_Y\" title=\"String SUB Line contains X but not Y\">String SUB Line contains X but not Y<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Find_and_Replace\"><\/span><strong>Find and Replace <\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<pre class=\"prettyprint\">sed -i 's|arp|\/sbin\/arp|g' \/etc\/init.d\/proxyarp<\/pre>\n<h2><span class=\"ez-toc-section\" id=\"Find_and_Delete\"><\/span><strong>Find and Delete<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<pre class=\"prettyprint\">sed -e '\/^$\/d' file.txt<\/pre>\n<h2><span class=\"ez-toc-section\" id=\"Remove_Multiple_words\"><\/span><strong>Remove Multiple words<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>This will remove word, word1, or word2 from the file input.txt<\/p>\n<pre class=\"prettyprint\">sed 's\/word\\|word1\\|word2\/\/g' input.txt<\/pre>\n<h2><span class=\"ez-toc-section\" id=\"Change_the_first_instance_on_each_line\"><\/span><strong>Change the first instance on each line <\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>This will substitute the 1 instance of the word dog for cat on each line.<\/p>\n<pre class=\"prettyprint\">sed 's\/dog\/cat\/1' newfile.txt<\/pre>\n<h2><span class=\"ez-toc-section\" id=\"Change_case\"><\/span><strong> Change case<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>This will change all the text to uppercase.<\/p>\n<pre>\u00a0<span class=\"prettyprint\">sed -e 's\/.*\/\\U&amp;\/g' input.txt<\/span><\/pre>\n<p>To only change a sub section of text to lower case then the following can be used (this will match everything between the first set of &#8220;).<\/p>\n<pre>sed -r 's\/(^.*\".*\\\" \\{)\/\\L\\1\/' input.txt<\/pre>\n<h2><span class=\"ez-toc-section\" id=\"Changing_multiple_files\"><\/span><strong>Changing multiple files<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Below will change all the files in \/etc from word1 to word2.<\/p>\n<pre class=\"prettyprint\">sed -i 's\/word1\/word2\/g' \/etc\/*<\/pre>\n<h2><span class=\"ez-toc-section\" id=\"Insert_Line\"><\/span><strong>Insert Line<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The following will insert a line with the string &#8220;hello&#8221; on the 6th line.<\/p>\n<pre class=\"prettyprint\">sed 6i\\hello yourfile.txt<\/pre>\n<h2><span class=\"ez-toc-section\" id=\"Remove_4_digits\"><\/span><strong>Remove 4 digits<br \/>\n<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The following will remove 4 digits from the beginning of the line.<\/p>\n<pre class=\"prettyprint\">sed 's\/^[0-9]\\{4\\}\/\/g' yourfile.txt<\/pre>\n<h2><span class=\"ez-toc-section\" id=\"String_SUB_Line_contains_X_but_not_Y\"><\/span>String SUB Line contains X but not Y<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Substitute string in line that contains X but does not contain Y.<\/p>\n<pre class=\"prettyprint\">sed '\/X\/ {\/Y\/! s\/replace\/with\/}' yourfile.txt<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Below are some of the common uses and commands for sed that I have come across over the years, Find and Replace sed -i &#8216;s|arp|\/sbin\/arp|g&#8217; \/etc\/init.d\/proxyarp Find and Delete sed -e &#8216;\/^$\/d&#8217; file.txt Remove Multiple words This will remove word, word1, or word2 from the file input.txt sed &#8216;s\/word\\|word1\\|word2\/\/g&#8217; input.txt Change the first instance on &#8230; <a title=\"Common Sed Examples\" class=\"read-more\" href=\"https:\/\/www.fir3net.com\/UNIX\/General-unix\/sed-by-example.html\" aria-label=\"Read more about Common Sed Examples\">Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[54],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Common Sed Examples - Fir3net<\/title>\n<meta name=\"description\" content=\"Below are some of the common uses and commands for sed that I have come across over the years, Find and Replace sed -i &#039;s|arp|\/sbin\/arp|g&#039;\" \/>\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.fir3net.com\/UNIX\/General-unix\/sed-by-example.html\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Common Sed Examples - Fir3net\" \/>\n<meta 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