![]() For instance, we may have a Python file that reads data files from different locations, performs some manipulation on them, and writes the resulting data file to another location. We will also demonstrate how to run Python files in the terminal and redirect the output of the script to a file.Ī Python file may contain a few up to several thousand lines of code that perform one or more tasks. We will learn how to create and open Python files in the terminal. In this article, we focus on how to interact with Python files. If you have any questions or comments, please leave them in the comments section below.Do you want to learn how to open or run Python files in the terminal? Read this article.Ī Python file or script is written in the Python language and saved with a ".py" extension. We first created a simple BASH script that included a function, and then demonstrated how to call the function from the command line using the bash -c and. This tutorial showed you how to run a function in a BASH script from the command line on a Linux system. To run this function from the command line, use the following command $ python myscript.py myFunction 1 2 Here is an example script with a function that takes two arguments and prints their sum # myscript.py For example, if the function takes two arguments arg1 and arg2, you can run it like this $ python myscript.py myFunction arg1 arg2 If the function takes any arguments, you can pass them after the function name, separated by spaces. For example, if you have a script called myscript.py with a function named myFunction, you can run the function from the command line like this ![]() To run a function in a script from the command line, you will need to specify the name of the script followed by the name of the function you want to run. Running a Python Script with Command Line Arguments Other tools such as bashdb or bashdbg offer more advanced debugging features such as breakpoints and variable inspection. You can turn off debugging output with the set +x command. One way to debug a function is to use the set -x command, which enables debugging output for the script and prints each command before it is executed. The return command is followed by the value you want to return, which is stored in the $? variable and can be accessed from the calling script or the command line.ĭebugging BASH functions − Debugging BASH functions can be difficult, especially for those new to BASH scripting. For example, you might create a function that calculates the square of a number and returns the result. Returning values from a function − BASH functions can return values using the return command. You can pass arguments to a function in BASH using variables such as $1, $2, etc., which represent the first, second, etc. For example, you might want to create a function that takes a username as an input and prints a personalized greeting. Passing arguments to a function − You can customize the behavior of a function by passing arguments to it. hello.sh helloĪdvanced actions while executing functions from bash script (dot) command to source the script and call the function $. To run a function from the command line, we need to use the bash -c command followed by the name of the script file and the name of the function.įor instance, to run the hello function from the hello.sh script, we can use the following command - $ bash -c "source hello.sh hello"Īlternatively, we can use the. Execute a Function from bash script in the Command Line hello.shĪs you can see, the script runs and prints the message "Hello, Earth!" to the terminal. Save the file and make it executable using the chmod command − $ chmod +x hello.sh Open a text editor and create a new file called "hello.sh" with the following code − #!/bin/bash To start, we will create a BASH script that contains a simple function that displays a message on the terminal. We will first create a simple BASH script that includes a function, and then demonstrate how to call the function from the command line. This tutorial will show you how to run a function in a BASH script from the command line on a Linux system. The required permissions to execute the script (read/write/execute). PrerequisitesĪ Linux system with a command line interface (or SSH access).Ī script containing a function you want to run (your custom script). Functions are blocks of code that complete a specific task and can be executed from within the script or from the command line. One of the useful features of BASH is the ability to create and use functions within script files. BASH (Bourne Again SHell) is a Unix shell and command language that is used frequently in Linux and other Unix-like operating systems.
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