Hi, folks from today 26th Nov 2024, I have started learning scripting to become a Highly Skilled DevOps engineer. Today I learned the basic workflow of scripting. **1. Basics of Scripting:-** Scripting is used to automate the repetitive or routine works which is engineers often face in DevOps culture. **2. Applications of Scripting:-** So, what are the applications of scripting? It is commonly used in **File Management** such as renaming, organising, deleting, etc. Other Application involves system monitoring, automation such as fetching APIs, backups etc. **3. Steps Involved to Automate a task:-** **(i)** The first step is to identify the problem and break it down into smaller pieces. eg. "Renaming files" -> first list all the files -> Modify the names -> save with new names. **(ii)** Choose a language, most commonly used in industries is Python or BASH, as they directly run without compilation. **(iii)** Design the Workflow- eg. File renaming involves: 1. Identify the directory 2. Loop through files. 3. Rename files using a pattern. **(iv)** Error Handling- Always ensure to handle issues like:- 1. Missing files. 2. Permission Denied. 3. Invalid input. **4. Core Concepts involved in Scripting:-** **Variables:** Store data for reusability. eg:- directory = "./files" **Loops:** Automate repetitive tasks. eg:- _for file in os.listdir(directory): print(file) _ **Functions:** Habit to modularise your script and keep it reusable. eg:- _def rename_file(old_name, new_name): os.rename(old_name, new_name) _ **File Handling:** Understanding of file handling is cruicial in Scripting. eg: _with open("abc.txt", "r") as f: data = f.read() _ **5. Common Tools and Libraries:-** **Python Libraries** **os:-** Interacts with the operating system. **shutil:-** Advanced file operations. **requests:-** Fetches data from API. **Linux/BASH Commands** **ls:-** List Directory. **mv:-** Rename or move files. **grep:-** Searches within file. **_Automate file renaming in Python:_** To automate file renaming using Python, you can use the os and the glob modules. **Prerequisite:** 1. Python(3.x) should installed in the system. 2. Familiarity with basic Python concepts. **Steps to Automate File Renaming:** **Identify the Directory:** The first step is to specify the directory where your files are located. You need to be able to access and modify these files programmatically. **List All Files:** Use Python’s os or glob module to list the files in the target directory. You can filter files based on extension if needed. **Define the Renaming Pattern:** Based on your needs, you can define a renaming pattern. This could involve adding prefixes, suffixes, or even modifying filenames based on a regex pattern. **Rename Files:** Using the os.rename() function, rename each file based on your defined pattern. Ensure that you handle potential errors (e.g., file already exists, permission issues, etc.). **Example: Renaming Files Based on a Pattern** Below is a simple Python script to rename files in a directory, appending a prefix and suffix: **_ ``` import os def rename_files_in_directory(directory, prefix, suffix, extension): # Change working directory to the target folder os.chdir(directory) # Get all files with the given extension for filename in os.listdir(directory): # Check if the file has the specified extension if filename.endswith(extension): # Define the new file name based on the prefix and suffix new_name = f"{prefix}_{filename[:-len(extension)]}_{suffix}{extension}" # Rename the file os.rename(filename, new_name) print(f"Renamed: {filename} -> {new_name}") directory = r"C:\path\to\your\folder" # Change this to your directory path prefix = "new" # Example: Adds "new" as prefix to filenames suffix = "v1" # Example: Adds "v1" as suffix to filenames extension = ".txt" # Modify this to match the file extension you're working with rename_files_in_directory(directory, prefix, suffix, extension) ``` ` _** **Explanation of the Script:** **os.chdir(directory):** Changes the working directory to the specified path so you can access the files. **os.listdir(directory):** Lists all the files in the directory. **filename.endswith(extension):** Filters files based on their extension (e.g., .txt). os.rename(filename, new_name): Renames the file with the new name. So, that's all for today, I will be posting regular updates about my Learning journey of Scripting. Make sure to follow.

shivajee98

Day 1 of Learning Scripting

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