How to Split a Large CSV File into Multiple Files Using bash
Learn how to efficiently split a large CSV file into multiple smaller files, each containing the header and 10,000 records, using bash in a Unix environment.
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How to Split a Large CSV File into Multiple Files Using bash
Handling large CSV files can be quite cumbersome. However, sometimes you may need to split these large files into smaller, more manageable chunks. In this post, we’ll explore how to split a large CSV file into multiple files, each containing a header and 10,000 records using bash in a Unix environment.
Prerequisites
Before we dive into the solution, ensure you have access to a Unix-like environment with bash. This guide assumes you have basic knowledge of command-line operations.
Step-by-Step Instructions
Prepare Your Environment
First, make sure you have your CSV file ready. For the purpose of this guide, let’s assume your file is named largefile.csv.
Extract the Header
To retain the header in all the split files, you'll need to extract it separately:
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Create the Split Files
Now, we will split the file using the split command. This command will split our largefile.csv into smaller files with 10,000 lines each, excluding the header:
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Here, tail -n +2 skips the header line, and split -l 10000 - split_file_ creates files with 10,000 lines each, naming them with the prefix split_file_.
Add the Header to Split Files
After splitting, the files will not have the header. To add the header back into each file, we can loop through the split files and prepend the header:
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This loop iterates over all files prefixed with split_file_, concatenates header.csv and the split file contents, and then renames the temporary file back to the original.
Cleanup (Optional)
Finally, if you wish to remove the temporary header.csv, you can do so:
[[See Video to Reveal this Text or Code Snippet]]
Conclusion
By following these steps, you can easily split a large CSV file into multiple smaller files while retaining the header in each file. This method ensures that each split file is manageable and retains the context provided by the original header.
Experiment with these commands on your files to understand the process better, and tailor it to your specific needs. Happy data handling!
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