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Learn how to efficiently create separate text files based on filenames extracted from a list, using a simple bash script!
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How to Create Text Files from a List of File Names in Bash

Managing a collection of files can sometimes feel overwhelming, especially when those files are grouped by certain attributes, like dates. If you've got a list of file names in a text file and want to create separate text files for each unique date, you're in the right place! In this guide, we will guide you through a simple solution using a bash script to automate the task.

The Problem

Imagine you have a text file named filenames.txt that contains various file names formatted with dates. Here’s an example of what the contents may look like:

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Your goal is to create separate text files for each date contained in the filenames. For instance, 19990101.txt should contain:

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The Solution: Using a Bash Script

Using a bash script is a straightforward and efficient way to achieve this task. Below, we’ll break down the steps involved in creating a simple script to automate the process of generating these date-specific text files.

Step-by-Step Guide

Open your terminal. You will need to have access to a command line interface (CLI) where you can run bash scripts.

Create a new bash script. You can do this with any text editor. For instance, you can create a script named create_files.sh.

Write the script. Use the following code to read from filenames.txt and create the associated text files for each date:

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Explanation of the Script

!/bin/bash: This line tells the system that this script should be run using the bash shell.

while read -r line; do: This loop reads each line from filenames.txt one by one.

date="${line:4:8}": This extracts the date from the filename. It starts from the fifth character (index 4) and goes eight characters further, capturing the formatted date.

echo "$line" >> "${date}.txt": This command appends the current filename to the text file named after the extracted date.

done < filenames.txt: This signifies the end of the loop and specifies the input file.

Step 4: Make Your Script Executable

After saving your script, you need to make it executable. Run the following command in your terminal:

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Step 5: Run Your Script

Execute your script by running:

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Once you run the script, it will generate .txt files named after each unique date, containing the respective filenames.

Conclusion

And there you have it! A simple solution to create separate text files based on a list of filenames organized by date. This bash script not only saves time but also streamline the file management process, making it easier to locate files associated with specific dates. Whether you're handling backup files or organizing project assets, this script will be a helpful tool in your workflow.

Now you can maximize your productivity and focus more on what truly matters in your tasks!