{"id":48347,"date":"2024-05-13T12:30:00","date_gmt":"2024-05-13T17:30:00","guid":{"rendered":"https:\/\/www.rosehosting.com\/blog\/?p=48347"},"modified":"2024-04-29T02:47:48","modified_gmt":"2024-04-29T07:47:48","slug":"what-is-the-bash-shebang","status":"publish","type":"post","link":"https:\/\/www.rosehosting.com\/blog\/what-is-the-bash-shebang\/","title":{"rendered":"What is the Bash Shebang and How to Use it"},"content":{"rendered":"<div id=\"bsf_rt_marker\"><\/div>\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2024\/05\/what-is-the-bash-shebang-and-how-to-use-it.webp\" alt=\"What is the Bash Shebang and How to Use it\" class=\"wp-image-48396\" srcset=\"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2024\/05\/what-is-the-bash-shebang-and-how-to-use-it.webp 1024w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2024\/05\/what-is-the-bash-shebang-and-how-to-use-it-300x169.webp 300w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2024\/05\/what-is-the-bash-shebang-and-how-to-use-it-150x84.webp 150w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2024\/05\/what-is-the-bash-shebang-and-how-to-use-it-768x432.webp 768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>This tutorial will explain what Bash Shebang is and how to use the Shebang characters in Bash scripts on the Linux system.<\/p>\n\n\n\n<p><b>Shebang<\/b> is a sequence of two characters: a number sign (#) and an exclamation mark (!) that gives us the #! at the beginning of every script we need to write. Shebang is also known as hashbang, pound-bang, or hash-pling. It is always defined in the first line of the script and is ignored by the interpreter.<\/p>\n\n\n\n<p>In the next paragraphs, we will show you how to use the Shebang with real examples. Let&#8217;s get started!<\/p>\n\n\n\n<!--more-->\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_66_1 counter-hierarchy ez-toc-counter ez-toc-transparent ez-toc-container-direction\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-66700fcc6b86b\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"ez-toc-cssicon\"><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-66700fcc6b86b\"  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.rosehosting.com\/blog\/what-is-the-bash-shebang\/#Prerequisites\" title=\"Prerequisites\">Prerequisites<\/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.rosehosting.com\/blog\/what-is-the-bash-shebang\/#1-Update-the-system\" title=\"1. Update the system\">1. Update the system<\/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.rosehosting.com\/blog\/what-is-the-bash-shebang\/#2-How-to-use-Shebang\" title=\"2. How to use Shebang\">2. How to use Shebang<\/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.rosehosting.com\/blog\/what-is-the-bash-shebang\/#3-Using-Shebang-in-Bash-Scripts\" title=\"3. Using Shebang in Bash Scripts\">3. Using Shebang in Bash Scripts<\/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.rosehosting.com\/blog\/what-is-the-bash-shebang\/#4-Using-Shebang-in-Python-Scripts\" title=\"4. Using Shebang in Python Scripts\">4. Using Shebang in Python Scripts<\/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.rosehosting.com\/blog\/what-is-the-bash-shebang\/#5-Using-Shebang-For-Other-Interpreters\" title=\"5. Using Shebang For Other Interpreters\">5. Using Shebang For Other Interpreters<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Prerequisites\"><\/span>Prerequisites<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul>\n<li>A server running <a href=\"https:\/\/www.rosehosting.com\/ubuntu-hosting\/\" target=\"_blank\" rel=\"noreferrer noopener\">any<\/a> <a href=\"https:\/\/www.rosehosting.com\/debian-hosting\/\" target=\"_blank\" rel=\"noreferrer noopener\">Linux<\/a> <a href=\"https:\/\/www.rosehosting.com\/ubuntu-hosting\/\">OS<\/a><\/li>\n\n\n\n<li>User privileges: root or non-root user with sudo privileges<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1-Update-the-system\"><\/span>1. Update the system<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Before doing anything on the server, we must update its packages to the latest available version. In this blog post, we will use the latest version of Ubuntu 24.04 OS.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sudo apt update -y &amp;&amp; sudo apt upgrade -y<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2-How-to-use-Shebang\"><\/span>2. How to use Shebang<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>As we already mentioned the Shebang <b>#!<\/b> is used on the first line of the script. It is threatened as a simple comment if used on the second, third, or other line. The Shebang directive has the following format:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">#!interpreter [options]<\/pre>\n\n\n\n<p>For example, to use the bash shell interpreter, we need to define the following line:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">#!\/bin\/bash<\/pre>\n\n\n\n<p>In this case, Shebang tells the system to use the <b>Bourne sh shell<\/b> to run the script.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3-Using-Shebang-in-Bash-Scripts\"><\/span>3. Using Shebang in Bash Scripts<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The most common usage of the Shebang is in the bash scripts. Including an appropriate shebang at the beginning of the script ensures that the desired shell interprets the script correctly. We can use two different methods to call the interpreter. The first method we already mentioned before:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">#!\/bin\/bash<\/pre>\n\n\n\n<p>The second method is:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">#!\/usr\/bin\/env bash<\/pre>\n\n\n\n<p>These lines instruct the OS to run the script using the Bash interpreter at \/bin\/bash. Let&#8217;s create a simple bash script using the bash interpreter:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">touch helloword.sh<\/pre>\n\n\n\n<p>Open the script with your favorite editor and paste the following lines of code:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">#!\/bin\/bash\necho \"Hello, world.\"\n<\/pre>\n\n\n\n<p>Save the file, close it, and make it executable with the command below:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">chmod +x helloword.sh<\/pre>\n\n\n\n<p>Once done, execute the script:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sh helloword.sh<\/pre>\n\n\n\n<p>You should receive the following output:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">root@host:~# sh helloword.sh\nHello, world.\n<\/pre>\n\n\n\n<p>Now, let&#8217;s create the script using the bash interpreter through env. You can remove and recreate the helloword.sh script or replace the lines of code with the following lines:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">#!\/usr\/bin\/env bash\necho \"Hello, world.\"\n<\/pre>\n\n\n\n<p>After executing the script, you should get the same output:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">root@host:~# sh helloword.sh\nHello, world.<\/pre>\n\n\n\n<p>Calling the bash interpreter using the second method is more flexible since the Bash interpreter can be installed in different locations.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4-Using-Shebang-in-Python-Scripts\"><\/span>4. Using Shebang in Python Scripts<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>We can specify the Python interpreter in the Shebang line to allow Bash script commands to be executed by Python script.<\/p>\n\n\n\n<p>touch pythonScript.py<\/p>\n\n\n\n<p>Open the file with your favorite editor and paste the following lines of code:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">#!\/usr\/bin\/env python3\nprint('Python is not just a snake. It is a programming language!')\n<\/pre>\n\n\n\n<p>Save the file, close it, and make it executable:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">chmod +x pythonScript.py<\/pre>\n\n\n\n<p>The <b>\/usr\/bin\/env<\/b> locates the Python interpreter, and the OS uses it to execute the script. Now execute the script:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">.\/pythonScript.py<\/pre>\n\n\n\n<p>You should receive the following output:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">root@host:~# .\/pythonScript.py\nPython is not just a snake. It is a programming language!<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5-Using-Shebang-For-Other-Interpreters\"><\/span>5. Using Shebang For Other Interpreters<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Shebang allows us to specify other interpreters than the bash or python. The other interpreters are Korn shell, Perl, shell as a configuration file, and many other custom interpreters.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">#!\/bin\/ksh\n\n#!\/usr\/bin\/env perl\n\n#!\/bin\/false\n<\/pre>\n\n\n\n<p>That&#8217;s it! You were introduced in the Bash scripts and the most important line the <b>Shebang<\/b>. If you have other questions about the Shebang and how to use it you can contact our technical support. We are available 24\/7 and will be glad to help you!<\/p>\n\n\n\n<p>PS. If you liked this post about Shebang and its usage, please share it with your friends on social networks or leave a comment in the comments section. Thank you.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This tutorial will explain what Bash Shebang is and how to use the Shebang characters in Bash scripts on the &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"What is the Bash Shebang and How to Use it\" class=\"read-more button\" href=\"https:\/\/www.rosehosting.com\/blog\/what-is-the-bash-shebang\/#more-48347\" aria-label=\"Read more about What is the Bash Shebang and How to Use it\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":48396,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2071],"tags":[1849,2141],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What is Bash Shebang and How to Use It? | RoseHosting<\/title>\n<meta name=\"description\" content=\"What is Bash Shebang and learn how to use the Shebang characters in Bash scripts on the Linux system using our step-by-step guide.\" \/>\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.rosehosting.com\/blog\/what-is-the-bash-shebang\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is Bash Shebang and How to Use It? 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