{"id":37895,"date":"2024-02-28T07:20:02","date_gmt":"2024-02-28T07:20:02","guid":{"rendered":"https:\/\/linuxsimply.com\/?p=37895"},"modified":"2024-03-18T05:36:19","modified_gmt":"2024-03-18T05:36:19","slug":"bash-help-function","status":"publish","type":"post","link":"https:\/\/linuxsimply.com\/bash-scripting-tutorial\/functions\/function-examples\/help-function\/","title":{"rendered":"How to Add Help Function in Bash Script [3 Methods]"},"content":{"rendered":"<p style=\"text-align: justify;\">Bash scripting offers a powerful means to automate tasks and streamline workflows in the command-line environment. However, as scripts grow in complexity, clarity and usability become paramount. One fundamental way of achieving this is the integration of a help method within Bash scripts. This article will dive into how to add the bash help method in the bash script.<\/p>\n<div class=\"su-button-center\"><a href=\"https:\/\/linuxsimply.com\/wp-content\/uploads\/2024\/02\/Practice-Files-for-the-Bash-Help-Function.zip\" class=\"su-button su-button-style-default\" style=\"color:#000000;background-color:#E8F9FF;border-color:#bac8cc;border-radius:56px\" target=\"_blank\" rel=\"noopener noreferrer\"><span style=\"color:#000000;padding:8px 26px;font-size:20px;line-height:30px;border-color:#effbff;border-radius:56px;text-shadow:0px 0px 0px #000000\"><i class=\"sui sui-download\" style=\"font-size:20px;color:#1AA1D6\"><\/i> Practice Files for the Bash Help Function<\/span><\/a><\/div>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><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><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/linuxsimply.com\/bash-scripting-tutorial\/functions\/function-examples\/help-function\/#What_is_the_%E2%80%9Chelp%E2%80%9D_Method_Within_a_Function_in_Bash\" >What is the \u201chelp\u201d Method Within a Function in Bash?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/linuxsimply.com\/bash-scripting-tutorial\/functions\/function-examples\/help-function\/#3_Methods_to_Add_Bash_%E2%80%9Chelp%E2%80%9D_Function\" >3 Methods to Add Bash \u201chelp\u201d Function<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/linuxsimply.com\/bash-scripting-tutorial\/functions\/function-examples\/help-function\/#1_Using_the_%E2%80%9Cgetopts%E2%80%9D_Command\" >1. Using the \u201cgetopts\u201d Command<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/linuxsimply.com\/bash-scripting-tutorial\/functions\/function-examples\/help-function\/#2_Using_the_%E2%80%9Cif%E2%80%9D_Statement\" >2. Using the \u201cif\u201d Statement<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/linuxsimply.com\/bash-scripting-tutorial\/functions\/function-examples\/help-function\/#3_Using_the_Conditional_Statement\" >3. Using the Conditional Statement<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/linuxsimply.com\/bash-scripting-tutorial\/functions\/function-examples\/help-function\/#Practice_Tasks_on_the_Bash_%E2%80%9Chelp%E2%80%9D_Function\" >Practice Tasks on the Bash \u201chelp\u201d Function<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/linuxsimply.com\/bash-scripting-tutorial\/functions\/function-examples\/help-function\/#Conclusion\" >Conclusion<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/linuxsimply.com\/bash-scripting-tutorial\/functions\/function-examples\/help-function\/#People_Also_Ask\" >People Also Ask<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/linuxsimply.com\/bash-scripting-tutorial\/functions\/function-examples\/help-function\/#What_is_the_help_command_in_bash\" >What is the help command in bash?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/linuxsimply.com\/bash-scripting-tutorial\/functions\/function-examples\/help-function\/#What_does_mean_in_bash\" >What does $@ mean in bash?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/linuxsimply.com\/bash-scripting-tutorial\/functions\/function-examples\/help-function\/#What_does_0_mean_in_bash\" >What does $0 mean in bash?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/linuxsimply.com\/bash-scripting-tutorial\/functions\/function-examples\/help-function\/#How_do_I_call_help_in_Linux\" >How do I call help in Linux?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/linuxsimply.com\/bash-scripting-tutorial\/functions\/function-examples\/help-function\/#What_is_command_line_help\" >What is command line help?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/linuxsimply.com\/bash-scripting-tutorial\/functions\/function-examples\/help-function\/#What_is_in_bash\" >What is $# in bash?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"What_is_the_%E2%80%9Chelp%E2%80%9D_Method_Within_a_Function_in_Bash\"><\/span>What is the \u201chelp\u201d Method Within a Function in Bash?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\">In bash scripting, the \u201chelp\u201d method within a function is a convention used to provide usage instructions, instructions, command syntax, and other helpful information about the function or script to the user. It is <strong>not<\/strong> a <strong>built-in<\/strong> method or command in bash but rather a <strong>user-defined function<\/strong> named \u201c<strong>help<\/strong>\u201d typically included within scripts or functions to display usage information.<\/p>\n<p style=\"text-align: justify;\">The &#8220;help&#8221; method is often called when the user requests help by passing a specific command-line option, such as <code class=\"\" data-line=\"\">-h<\/code> or <code class=\"\" data-line=\"\">--help<\/code>. When the help option is detected, the script or function invokes the &#8220;help&#8221; method to print out a concise and informative message explaining how to use the script or function, including details about available options, arguments, and usage examples.<\/p>\n<p style=\"text-align: justify;\">Here is the basic syntax of how to add help method in a bash script:<\/p>\n<pre><code class=\"language-bash\" data-line=\"\">show_help() {\n  echo &quot;Usage: $(basename $0) [OPTIONS]&quot;\n  echo &quot;Options:&quot;\n  echo &quot;  -h, --help     Display this help message&quot;\n  echo &quot;  -v, --version  Display version information&quot;\n  # Add more options and descriptions as needed\n  exit 0\n}\n\nif [[ &quot;$1&quot; == &quot;-h&quot; || &quot;$1&quot; == &quot;--help&quot; ]]; then\n  show_help\nfi<\/code><\/pre>\n<p style=\"text-align: justify;\">Here the <code class=\"\" data-line=\"\">show_help<\/code> function is defined to display usage instructions and available options when the script is executed with the <code class=\"\" data-line=\"\">-h<\/code> or <code class=\"\" data-line=\"\">--help<\/code> option.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"3_Methods_to_Add_Bash_%E2%80%9Chelp%E2%80%9D_Function\"><\/span>3 Methods to Add Bash \u201chelp\u201d Function<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\">The \u201chelp\u201d method provides users with crucial guidance on script usage, options, and functionalities. This article will explore various approaches, from leveraging built-in commands like \u201cgetopts\u201d to crafting custom conditional statements.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"1_Using_the_%E2%80%9Cgetopts%E2%80%9D_Command\"><\/span>1. Using the \u201cgetopts\u201d Command<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\">The \u201cgetopts\u201d is a <strong>built-in shell command<\/strong> in bash that facilitates the parsing of command line options and arguments. It simplifies the process of handling the command line arguments by providing a convenient way to iterate over options and their arguments. This command streamlines the creation of the help method in the\u00a0 Bash script by efficiently managing command-line inputs and their corresponding actions.<\/p>\n<p style=\"text-align: justify;\">The following bash script which creates a rectangular pattern uses the \u201cgetopts\u201d command to create a help method for the bash script:<\/p>\n<pre><code class=\"language-bash\" data-line=\"\">#!\/bin\/bash\n\n# Default values\nlength=3\nwidth=2\n\n# Define the help method\nhelp() {\n  echo &quot;Usage: $(basename $0) [-h] [-l LENGTH] [-w WIDTH]&quot;\n  echo &quot;Options:&quot;\n  echo &quot;  -h, --help     Display this help message&quot;\n  echo &quot;  -l, --length   Set the length of the rectangular pattern&quot;\n  echo &quot;  -w, --width    Set the width of the rectangular pattern&quot;\n  exit 0\n}\n\n# Parse command-line options\nwhile getopts &quot;:hl:w:&quot; opt; do\n  case $opt in\n    h) help ;;\n    l) length=$OPTARG ;;\n    w) width=$OPTARG ;;\n    \\?) echo &quot;Invalid option: -$OPTARG&quot; &gt;&amp;2; exit 1 ;;\n  esac\ndone\n\n# Main script logic\nfor (( i = 0; i &lt; length; i++ )); do\n  for (( j = 0; j &lt; width; j++ )); do\n    echo -n &quot;* &quot;\n  done\n  echo\ndone<\/code><\/pre>\n<div class=\"su-box su-box-style-default\" id=\"\" style=\"border-color:#aeb0b3;border-radius:0px;max-width:none\"><div class=\"su-box-title\" style=\"background-color:#e1e3e6;color:#000000;border-top-left-radius:0px;border-top-right-radius:0px\">EXPLANATION<\/div><div class=\"su-box-content su-u-clearfix su-u-trim\" style=\"border-bottom-left-radius:0px;border-bottom-right-radius:0px\">\n<p>This Bash script generates a rectangular pattern of asterisks, with default dimensions of 3 rows by 2 columns. It allows users to customize the dimensions using command line options. The script defines a help method to display usage instructions and available options. It then parses command line options using the \u201cgetopts\u201d command to allow users to specify the pattern&#8217;s length and width. Then the script iterates through the specified dimensions and prints the rectangular pattern using nested loops.<\/p>\n<\/div><\/div>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter wp-image-37909 size-full\" src=\"https:\/\/linuxsimply.com\/wp-content\/uploads\/2024\/02\/1.-using-getopts-command.png\" alt=\"In bash scripting add the help method within a function using &quot;getopts&quot; command\" width=\"825\" height=\"415\" srcset=\"https:\/\/linuxsimply.com\/wp-content\/uploads\/2024\/02\/1.-using-getopts-command.png 825w, https:\/\/linuxsimply.com\/wp-content\/uploads\/2024\/02\/1.-using-getopts-command-300x151.png 300w, https:\/\/linuxsimply.com\/wp-content\/uploads\/2024\/02\/1.-using-getopts-command-768x386.png 768w\" sizes=\"(max-width: 825px) 100vw, 825px\" \/><\/p>\n<p style=\"text-align: justify;\">Here, the script is executed with the help option to check the usage case and the available options.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"2_Using_the_%E2%80%9Cif%E2%80%9D_Statement\"><\/span>2. Using the \u201cif\u201d Statement<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\">In bash scripting, the <a href=\"https:\/\/linuxsimply.com\/bash-scripting-tutorial\/conditional-statements\/if\/\" target=\"_blank\" rel=\"noopener\"><strong>if statement<\/strong><\/a> is used to execute a block of code on the evaluation of a condition. It helps in controlling the flow of the script. It can be used within the bash script to check whether the user has provided the <code class=\"\" data-line=\"\">-h<\/code> or <code class=\"\" data-line=\"\">--help<\/code>\u00a0option. If the script detects the help option then it can echo the usage instructions and available options to the user. Which helps the user to understand how to use the script and its functionalities effectively. In the following script the if conditional statement creates and handles the help method:<\/p>\n<pre><code class=\"language-bash\" data-line=\"\">#!\/bin\/bash\n\n# Define the help method\nif [[ $1 == &quot;-h&quot; || $1 == &quot;--help&quot; ]]; then\n  echo &quot;Usage: $(basename $0) [NUM]&quot;\n  echo &quot;Options:&quot;\n  echo &quot;  NUM            Number of elements in the Fibonacci sequence&quot;\n  echo &quot;  -h, --help     Display this help message&quot;\n  exit 0\nfi\n\n# Fibonacci sequence logic\nif [ -z &quot;$1&quot; ]; then\n  echo &quot;Error: Missing argument. Please provide the number of elements in the Fibonacci sequence.&quot;\n  exit 1\nfi\n\nn=$1\na=0\nb=1\necho &quot;Fibonacci Sequence:&quot;\nfor (( i=0; i&lt;n; i++ )); do\n  echo -n &quot;$a &quot;\n  temp=$((a + b))\n  a=$b\n  b=$temp\ndone\necho\n<\/code><\/pre>\n<div class=\"su-box su-box-style-default\" id=\"\" style=\"border-color:#aeb0b3;border-radius:0px;max-width:none\"><div class=\"su-box-title\" style=\"background-color:#e1e3e6;color:#000000;border-top-left-radius:0px;border-top-right-radius:0px\">EXPLANATION<\/div><div class=\"su-box-content su-u-clearfix su-u-trim\" style=\"border-bottom-left-radius:0px;border-bottom-right-radius:0px\">\n<p>This bash script generates a fibonacci sequence based on the user-provided number of elements. It begins by checking if the user requested for help method. If so then it displays the usage instructions and available options. Then it verifies if the user has provided the number of elements for the fibonacci sequence. If not then it prompts the user to provide the missing number. If it gets a valid number then the script calculates and echoes the fibonacci sequence using a for loop.<\/p>\n<\/div><\/div>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-37910 size-full\" src=\"https:\/\/linuxsimply.com\/wp-content\/uploads\/2024\/02\/2.-using-if-statement.png\" alt=\"In bash scripting add the help method within a function using &quot;if&quot; statement\" width=\"825\" height=\"264\" srcset=\"https:\/\/linuxsimply.com\/wp-content\/uploads\/2024\/02\/2.-using-if-statement.png 825w, https:\/\/linuxsimply.com\/wp-content\/uploads\/2024\/02\/2.-using-if-statement-300x96.png 300w, https:\/\/linuxsimply.com\/wp-content\/uploads\/2024\/02\/2.-using-if-statement-768x246.png 768w\" sizes=\"(max-width: 825px) 100vw, 825px\" \/><\/p>\n<p style=\"text-align: justify;\">Here, after the script is executed with the help option the script\u2019s use cases and the options are shown.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"3_Using_the_Conditional_Statement\"><\/span>3. Using the Conditional Statement<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\">The <a href=\"https:\/\/linuxsimply.com\/bash-scripting-tutorial\/conditional-statements\/\" target=\"_blank\" rel=\"noopener\"><strong>conditional statement<\/strong><\/a> is a programming construct that allows to execution of different blocks of code based on the evaluation of a condition. In other words, it enables the user to control the flow of the script by making decisions. In bash scripting, conditional statements are often used to check for certain conditions and perform action accordingly.<\/p>\n<p style=\"text-align: justify;\">To create a help method for a bash function, you can use conditional statements to check if the user has requested help by passing a specific flag or option like <code class=\"\" data-line=\"\">-h<\/code> or <code class=\"\" data-line=\"\">--help<\/code>. If a help option is detected then the script can display usage instructions, command syntax, and a list of available options to guide the user on how to use the script or function effectively.<\/p>\n<p style=\"text-align: justify;\">Here is a bash script to showcase how to do so:<\/p>\n<pre><code class=\"language-bash\" data-line=\"\">#!\/bin\/bash\n\n# Define the help method\nget_help() {\n  echo &quot;Usage: $(basename $0) [-h] [-s NUM] [-r NUM] [NUM1] [NUM2] [OPERATOR]&quot;\n  echo &quot;Options:&quot;\n  echo &quot;  -h, --help      Display this help message&quot;\n  echo &quot;  -s, --square    Calculate the square of a number&quot;\n  echo &quot;  -r, --root      Calculate the square root of a number&quot;\n  echo &quot;  NUM1            First number for arithmetic operation&quot;\n  echo &quot;  NUM2            Second number for arithmetic operation&quot;\n  echo &quot;  OPERATOR        Arithmetic operator (+, -, *, \/)&quot;\n  exit 0\n}\n\n# Check if no arguments provided\nif [ $# -eq 0 ]; then\n  echo &quot;Error: No arguments provided.&quot;\n  get_help\nfi\n\n# Parse command-line options\nif [ &quot;$1&quot; == &quot;-h&quot; ] || [ &quot;$1&quot; == &quot;--help&quot; ]; then\n  get_help\nelif [ &quot;$1&quot; == &quot;-s&quot; ] || [ &quot;$1&quot; == &quot;--square&quot; ]; then\n  if [ -z &quot;$2&quot; ]; then\n    echo &quot;Error: Missing argument for square operation.&quot;\n    exit 1\n  else\n    echo &quot;Square of $2: $(echo &quot;$2^2&quot; | bc)&quot;\n    exit 0\n  fi\nelif [ &quot;$1&quot; == &quot;-r&quot; ] || [ &quot;$1&quot; == &quot;--root&quot; ]; then\n  if [ -z &quot;$2&quot; ]; then\n    echo &quot;Error: Missing argument for root operation.&quot;\n    exit 1\n  else\n    echo &quot;Square root of $2: $(echo &quot;sqrt($2)&quot; | bc)&quot;\n    exit 0\n  fi\nfi\n\n# Check for correct number of arguments for arithmetic operations\nif [ &quot;$#&quot; -ne 3 ]; then\n  echo &quot;Usage: $(basename $0) NUM1 NUM2 OPERATOR&quot;\n  exit 1\nfi\n\n# Perform arithmetic operations\nnum1=$1\nnum2=$2\noperator=$3\n\ncase $operator in\n  +) echo &quot;Sum of $num1 and $num2: $(echo &quot;$num1 + $num2&quot; | bc)&quot; ;;\n  -) echo &quot;Difference of $num1 and $num2: $(echo &quot;$num1 - $num2&quot; | bc)&quot; ;;\n  \\*) echo &quot;Product of $num1 and $num2: $(echo &quot;$num1 * $num2&quot; | bc)&quot; ;;\n  \/) \n    if [ &quot;$num2&quot; -eq 0 ]; then\n      echo &quot;Error: Cannot divide by zero.&quot;\n      exit 1\n    else\n      echo &quot;Quotient of $num1 and $num2: $(echo &quot;scale=2; $num1 \/ $num2&quot; | bc)&quot;\n    fi ;;\n  *) echo &quot;Invalid operator: $operator. Supported operators are +, -, *, \/&quot; ;;\nesac\n<\/code><\/pre>\n<div class=\"su-box su-box-style-default\" id=\"\" style=\"border-color:#aeb0b3;border-radius:0px;max-width:none\"><div class=\"su-box-title\" style=\"background-color:#e1e3e6;color:#000000;border-top-left-radius:0px;border-top-right-radius:0px\">EXPLANATION<\/div><div class=\"su-box-content su-u-clearfix su-u-trim\" style=\"border-bottom-left-radius:0px;border-bottom-right-radius:0px\">\n<p>This bash script serves as a basic arithmetic calculator with support for various operations. It starts by defining a help method that displays usage instructions and available options when prompted by the user. The script then checks if any arguments are provided. If not displays an error message along with the help message. It also parses the command line options to calculate the square or square root of a number with <code class=\"\" data-line=\"\">-s<\/code> and <code class=\"\" data-line=\"\">-r<\/code> options respectively. It also can perform basic arithmetic operations based on the provided numbers and the operator and echoes the output accordingly.<\/p>\n<\/div><\/div>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-37911 size-full\" src=\"https:\/\/linuxsimply.com\/wp-content\/uploads\/2024\/02\/3.-using-conditional-statement.png\" alt=\"In bash scripting add the help method within a function using conditional statement\" width=\"825\" height=\"425\" srcset=\"https:\/\/linuxsimply.com\/wp-content\/uploads\/2024\/02\/3.-using-conditional-statement.png 825w, https:\/\/linuxsimply.com\/wp-content\/uploads\/2024\/02\/3.-using-conditional-statement-300x155.png 300w, https:\/\/linuxsimply.com\/wp-content\/uploads\/2024\/02\/3.-using-conditional-statement-768x396.png 768w\" sizes=\"(max-width: 825px) 100vw, 825px\" \/><\/p>\n<p style=\"text-align: justify;\">Here, first, the bash script is executed with the help option to check the usages and options of the bash script. Then the script was called multiple times to showcase the use cases of those options.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Practice_Tasks_on_the_Bash_%E2%80%9Chelp%E2%80%9D_Function\"><\/span>Practice Tasks on the Bash \u201chelp\u201d Function<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\">If you aim to be better at using the Bash help method, then you can try creating a Bash script for the following problems with the Bash help method:<\/p>\n<ol>\n<li style=\"text-align: justify;\">Create a Bash script with the help method that calculates the factorial of a given number.<\/li>\n<li style=\"text-align: justify;\">Write a Bash script that checks whether a given number is prime or not. Include the help method.<\/li>\n<\/ol>\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\">In conclusion, including a &#8220;help&#8221; method within a Bash script or function is a best practice for ensuring that users can easily understand how to interact with the script or function and leverage its features effectively. I hope this article will help you manage and document your bash function and script more efficiently and let you have a better Linux experience.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"People_Also_Ask\"><\/span>People Also Ask<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"What_is_the_help_command_in_bash\"><\/span>What is the help command in bash?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\">The <strong>help command<\/strong> in bash is a built-in command that provides information and documentation about other bash shell built-in commands and functions. It allows users to access concise descriptions, usage examples, and syntax details for various commands directly from the command line interface. Users can simply type <code class=\"\" data-line=\"\">help<\/code> followed by the command name they want to learn more about to retrieve information. This command is invaluable for beginners learning bash and experienced users seeking quick reference materials fostering efficient command line navigation and troubleshooting.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_does_mean_in_bash\"><\/span>What does $@ mean in bash?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\">In Bash scripting, <code class=\"\" data-line=\"\">$@<\/code> represents all the command-line arguments passed to a script or function. It preserves the exact words and spacing of each argument as they were provided. Unlike <code class=\"\" data-line=\"\">$*<\/code>, which treats all arguments as a single entity, <code class=\"\" data-line=\"\">$@<\/code> allows for the individual handling of each argument. This distinction is crucial for scripts that need to process multiple arguments separately. By using <code class=\"\" data-line=\"\">$@<\/code>, scripts can iterate through and manipulate each argument independently.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_does_0_mean_in_bash\"><\/span>What does $0 mean in bash?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\">In bash scripting, <a href=\"https:\/\/linuxsimply.com\/bash-scripting-tutorial\/parameters\/dollar-0\/\" target=\"_blank\" rel=\"noopener\"><strong>$0<\/strong><\/a> represents the name of the script or shell program being executed. It allows scripts to refer to themselves dynamically enabling self-referential behavior. When a script is invoked <code class=\"\" data-line=\"\">$0<\/code> provides the script\u2019s filename or the name of the shell command being executed. This variable is useful for scripts that need to determine their own names for logging, error handling, or self-awareness purposes.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_do_I_call_help_in_Linux\"><\/span>How do I call help in Linux?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\">To call for help in Linux, you can use the <a href=\"https:\/\/linuxsimply.com\/man-command-in-linux\/\" target=\"_blank\" rel=\"noopener\"><strong>man command<\/strong><\/a> followed by the name of the command, utility or topic you need assistance with. For example, to learn about the <a href=\"https:\/\/linuxsimply.com\/ls-command-in-linux\/\" target=\"_blank\" rel=\"noopener\"><strong>ls command<\/strong><\/a>, you can type <code class=\"\" data-line=\"\">man ls<\/code> in the terminal and press <strong>ENTER<\/strong>. This action opens the manual page for the specified command, displaying detailed information, options, and usage instructions. The <code class=\"\" data-line=\"\">man<\/code> command is a powerful tool for accessing comprehensive documentation directly from the terminal.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_is_command_line_help\"><\/span>What is command line help?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\">Command line help refers to the assistance and guidance provided to users directly from the command line interface of an operating system or software application. It typically includes documentation, usage instructions, and descriptions of available commands, options, and functionalities. Command line help enables users to quickly access information about specific commands or utilities, aiding them in understanding how to use the software effectively. By typing commands such as <code class=\"\" data-line=\"\">help<\/code>\u00a0or appending <code class=\"\" data-line=\"\">--help<\/code>\u00a0to a command, users can retrieve contextual help directly within the command line interface.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_is_in_bash\"><\/span>What is $# in bash?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\">In Bash scripting, <code class=\"\" data-line=\"\">$#<\/code> represents the number of positional parameters passed to a script or function. It provides a count of arguments provided to the script or function when it is invoked. For example, if a script is called with three arguments, <code class=\"\" data-line=\"\">$#<\/code> will return the value 3. This parameter is valuable for scripts that need to dynamically adapt their behavior based on the number of arguments provided during execution. By accessing <code class=\"\" data-line=\"\">$#<\/code> within a Bash script, users can create more flexible and responsive scripts that handle varying numbers of inputs efficiently.<\/p>\n<p><script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [{\n    \"@type\": \"Question\",\n    \"name\": \"What is the help command in bash?\",\n    \"acceptedAnswer\": {\n      \"@type\": \"Answer\",\n      \"text\": \"The help command in bash is a built-in command that provides information and documentation about other bash shell built-in commands and functions. It allows users to access concise descriptions, usage examples, and syntax details for various commands directly from the command line interface. Users can simply type \u201chelp\u201d followed by the command name they want to learn more about to retrieve information. 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By typing commands such as \\\"help\\\" or appending \\\"--help\\\" to a command, users can retrieve contextual help directly within the command line interface.\"\n    }\n  },{\n    \"@type\": \"Question\",\n    \"name\": \"What is $# in bash?\",\n    \"acceptedAnswer\": {\n      \"@type\": \"Answer\",\n      \"text\": \"In Bash scripting, $# represents the number of positional parameters passed to a script or function. It provides a count of arguments provided to the script or function when it is invoked. For example, if a script is called with three arguments, $# will return the value 3. This parameter is valuable for scripts that need to dynamically adapt their behavior based on the number of arguments provided during execution. By accessing $# within a Bash script, users can create more flexible and responsive scripts that handle varying numbers of inputs efficiently.\"\n    }\n  }]\n}\n<\/script><\/p>\n<p><span style=\"font-size: 18pt; color: #003366;\"><strong>Related Articles<\/strong><\/span><\/p>\n<ul>\n<li><strong><a class=\"in-cell-link\" href=\"https:\/\/linuxsimply.com\/bash-scripting-tutorial\/functions\/function-examples\/print-function\/\" target=\"_blank\" rel=\"noopener\">How to Print Function Definition in Bash [8 Methods]<\/a><\/strong><\/li>\n<li><strong><a class=\"in-cell-link\" href=\"https:\/\/linuxsimply.com\/bash-scripting-tutorial\/functions\/function-examples\/if-function\/\" target=\"_blank\" rel=\"noopener\">How to Use \u201cif\u201d Statement in Bash Function [7 Examples]<\/a><\/strong><\/li>\n<li><strong><a class=\"in-cell-link\" href=\"https:\/\/linuxsimply.com\/bash-scripting-tutorial\/functions\/function-examples\/empty-function\/\" target=\"_blank\" rel=\"noopener\">Bash Empty Function [A Complete Guide]<\/a><\/strong><\/li>\n<li><strong><a class=\"in-cell-link\" href=\"https:\/\/linuxsimply.com\/bash-scripting-tutorial\/functions\/function-examples\/unset-function\/\" target=\"_blank\" rel=\"noopener\">Unset Bash Function Using \u201cunset\u201d Command [3 Examples]<\/a><\/strong><\/li>\n<\/ul>\n<hr \/>\n<p><strong>&lt;&lt; Go Back to <span data-sheets-root=\"1\" data-sheets-value=\"{&quot;1&quot;:2,&quot;2&quot;:&quot;Bash Function Examples&quot;}\" data-sheets-userformat=\"{&quot;2&quot;:1074113,&quot;3&quot;:{&quot;1&quot;:0},&quot;9&quot;:1,&quot;10&quot;:1,&quot;11&quot;:4,&quot;12&quot;:0,&quot;16&quot;:12,&quot;17&quot;:1,&quot;23&quot;:1}\" data-sheets-hyperlink=\"https:\/\/linuxsimply.com\/bash-scripting-tutorial\/functions\/function-examples\/\"><a class=\"in-cell-link\" href=\"https:\/\/linuxsimply.com\/bash-scripting-tutorial\/functions\/function-examples\/\" target=\"_blank\" rel=\"noopener\">Bash Function Examples<\/a><\/span> | <span data-sheets-root=\"1\" data-sheets-value=\"{&quot;1&quot;:2,&quot;2&quot;:&quot;Bash Functions&quot;}\" data-sheets-userformat=\"{&quot;2&quot;:1074113,&quot;3&quot;:{&quot;1&quot;:0},&quot;9&quot;:1,&quot;10&quot;:1,&quot;11&quot;:4,&quot;12&quot;:0,&quot;16&quot;:12,&quot;17&quot;:1,&quot;23&quot;:1}\" data-sheets-hyperlink=\"https:\/\/linuxsimply.com\/bash-scripting-tutorial\/functions\/\"><a class=\"in-cell-link\" href=\"https:\/\/linuxsimply.com\/bash-scripting-tutorial\/functions\/\" target=\"_blank\" rel=\"noopener\">Bash Functions<\/a><\/span>\u00a0| <span data-sheets-root=\"1\" data-sheets-value=\"{&quot;1&quot;:2,&quot;2&quot;:&quot;Bash Scripting Tutorial&quot;}\" data-sheets-userformat=\"{&quot;2&quot;:1074113,&quot;3&quot;:{&quot;1&quot;:0},&quot;9&quot;:1,&quot;10&quot;:1,&quot;11&quot;:4,&quot;12&quot;:0,&quot;16&quot;:12,&quot;17&quot;:1,&quot;23&quot;:1}\" data-sheets-hyperlink=\"https:\/\/linuxsimply.com\/bash-scripting-tutorial\/\"><a class=\"in-cell-link\" href=\"https:\/\/linuxsimply.com\/bash-scripting-tutorial\/\" target=\"_blank\" rel=\"noopener\">Bash Scripting Tutorial<\/a><\/span><\/strong><\/p>\n\n\n<div class=\"kk-star-ratings kksr-auto kksr-align-center kksr-valign-bottom\"\n    data-payload='{&quot;align&quot;:&quot;center&quot;,&quot;id&quot;:&quot;37895&quot;,&quot;slug&quot;:&quot;default&quot;,&quot;valign&quot;:&quot;bottom&quot;,&quot;ignore&quot;:&quot;&quot;,&quot;reference&quot;:&quot;auto&quot;,&quot;class&quot;:&quot;&quot;,&quot;count&quot;:&quot;8&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;5&quot;,&quot;starsonly&quot;:&quot;&quot;,&quot;best&quot;:&quot;5&quot;,&quot;gap&quot;:&quot;5&quot;,&quot;greet&quot;:&quot;Rate this post&quot;,&quot;legend&quot;:&quot;5\\\/5 - (8 votes)&quot;,&quot;size&quot;:&quot;24&quot;,&quot;title&quot;:&quot;How to Add Help Function in Bash Script [3 Methods]&quot;,&quot;width&quot;:&quot;142.5&quot;,&quot;_legend&quot;:&quot;{score}\\\/{best} - ({count} {votes})&quot;,&quot;font_factor&quot;:&quot;1.25&quot;}'>\n            \n<div class=\"kksr-stars\">\n    \n<div class=\"kksr-stars-inactive\">\n            <div class=\"kksr-star\" data-star=\"1\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"2\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"3\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"4\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"5\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n    \n<div class=\"kksr-stars-active\" style=\"width: 142.5px;\">\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; 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However, as scripts grow &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"How to Add Help Function in Bash Script [3 Methods]\" class=\"read-more button\" href=\"https:\/\/linuxsimply.com\/bash-scripting-tutorial\/functions\/function-examples\/help-function\/#more-37895\" aria-label=\"Read more about How to Add Help Function in Bash Script [3 Methods]\">Read more<\/a><\/p>\n","protected":false},"author":314909,"featured_media":37912,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[102],"tags":[203],"class_list":["post-37895","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bash-scripting","tag-function-examples","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-33"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Add Help Function in Bash Script [3 Methods] - 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I am Ridoy Chandra Shil, currently working as a Linux Content Developer Executive at SOFTEKO. I am a Biomedical Engineering graduate from Bangladesh University of Engineering and Technology. I am a science and tech enthusiast. In my free time, I read articles about new tech and watch documentaries on science-related topics. I am also a big fan of \u201cThe Big Bang Theory\u201d. 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