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How to Pass Data From Terminal In Elixir?

5 minutes read

To pass data from terminal in Elixir, you can use command line arguments when running your Elixir script. These arguments can be accessed using the System.argv() function, which returns a list of strings representing the command line arguments passed to the script. You can then process these arguments in your Elixir code to extract and use the data as needed. Additionally, you can also use environment variables or standard input to pass data from the terminal to your Elixir script.


How to use IO.puts/1 in Elixir to display data in the terminal?

To use IO.puts/1 in Elixir to display data in the terminal, you can do the following:

  1. Open your terminal and start an Elixir interactive shell by running iex.
  2. Use IO.puts/1 followed by the data you want to display as an argument. For example: 
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IO.puts("Hello, Elixir!")


This will output:

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Hello, Elixir!


You can also use variables with IO.puts/1:

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name = "Alice"
IO.puts("Hello, #{name}!")


This will output:

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Hello, Alice!


  1. Press Enter after entering the IO.puts/1 statement to see the output displayed in the terminal.


That's how you can use IO.puts/1 in Elixir to display data in the terminal.


What is the difference between IO.gets_b and IO.gets_b! in Elixir?

In Elixir, IO.gets_b and IO.gets_b! are both used to read a line of input from the console as binary data. The main difference between the two is that IO.gets_b is a non-blocking operation, meaning it will return {:ok, data} if it successfully reads input, or :ok with an empty string if there is no input available. On the other hand, IO.gets_b! is a blocking operation, which means it will wait for user input before returning the input as binary data. Using IO.gets_b! will pause the execution of the program until the user enters input.


In summary:

  • IO.gets_b is a non-blocking operation that returns input if available, or an empty string if not.
  • IO.gets_b! is a blocking operation that will pause the program until user input is provided.


What is the difference between IO.gets!/1 and IO.getn!/1 in Elixir?

In Elixir, IO.gets!/1 reads a line of input from the console, while IO.getn!/1 reads a predetermined number of characters from the console.


IO.gets!/1 takes an optional argument specifying the maximum number of bytes to read, and reads a line of input from the console, blocking until a line is available.


IO.getn!/1 also takes an optional argument specifying the maximum number of bytes to read, and reads that number of characters from the console, blocking until the specified number of characters is available.


So, the main difference between IO.gets!/1 and IO.getn!/1 is that IO.gets!/1 reads a line of input, while IO.getn!/1 reads a specified number of characters.


How to pass data from terminal in Elixir using IO.getn!/2?

To pass data from the terminal in Elixir using IO.getn!/2, you can use the following steps:

  1. Call the IO.getn!/2 function and pass in the prompt message as the first argument and the number of characters to read as the second argument.
  2. Store the input value returned by IO.getn!/2 in a variable.
  3. Use the input value in your Elixir code as needed.


Here is an example of how you can pass data from the terminal using IO.getn!/2:

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IO.puts("Enter your name: ")
name = IO.getn!("", 10)   # Reads up to 10 characters from the terminal input
IO.puts("Hello, #{name}!")


When you run this code in the terminal, it will prompt the user to enter their name and read up to 10 characters of input. It will then print out a greeting message using the entered name.


You can adjust the number of characters to read in IO.getn!/2 based on your requirements. Just make sure to handle any errors that may occur if the input exceeds the specified length.


How to pass data from terminal in Elixir using IO.getn/2?

To pass data from the terminal in Elixir using IO.getn/2, you can use the following approach:

  1. Use IO.getn/2 to read input from the terminal. The syntax for IO.getn/2 is as follows: IO.getn(device \\ :standard_io, term \\ :line)
  2. You can simply call IO.getn/2 and pass the device as :standard_io to read the input from the terminal.
  3. Here is an example code snippet to demonstrate how you can pass data from the terminal using IO.getn/2: defmodule Main do def main do IO.puts("Enter some data:") data = IO.getn() IO.puts("You entered: #{data}") end end Main.main()
  4. Run the above Elixir code in your terminal. It will prompt you to enter some data. Once you enter the data and press Enter, it will display the data you entered.
  5. You can also change the term parameter of IO.getn/2 to specify how you want to read the input (e.g., :line, :all, etc.).


By following the above steps, you can easily pass data from the terminal in Elixir using IO.getn/2.


How to pass data from terminal in Elixir using IO.gets_b!/2?

To pass data from the terminal in Elixir using IO.gets_b!/2, you can use the following steps:

  1. Use the IO.gets_b!/2 function to read data from the standard input (terminal). This function will block until a line of input is provided.
  2. Prompt the user for input by using the IO.puts/2 function before calling IO.gets_b!/2. For example, you can display a message like "Enter your name: ".
  3. Use the returned value from IO.gets_b!/2 to store the input data in a variable. You can then process this data as needed in your Elixir program.


Here is an example of how you can pass data from the terminal in Elixir using IO.gets_b!/2:

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IO.puts("Enter your name: ")
name = IO.gets_b!(:stdio)

IO.puts("Hello, #{name}!")


In this example, the user is prompted to enter their name, which is then stored in the name variable. The program then outputs a greeting message using the entered name.

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