Creating & Managing Files

Now that you know how to navigate through directories in the terminal, the next step is learning how to create, edit, and manage files effectively. This skill is essential when working in WSL (Ubuntu) or macOS, where you’ll often handle Python scripts, simulation input files, and data directly through the terminal.

Creating New Files

There are several ways to create files in the terminal — depending on whether you just want to make an empty file or open one for editing.

Command	Description	Example
touch filename	Create an empty file	touch beam_simulation.py
code filename	Open the file in Visual Studio Code	code notes.txt
echo "text" > filename	Create a file with initial text	echo "Initial parameters" > params.txt

Tip: If a file already exists, using > will overwrite it, while >> will append text to the end. Example:

echo "Added a new note" >> notes.txt

Viewing Files

To check the contents of a file directly from the terminal, you can use one of these commands:

Command	Description	Example
cat filename	Display the entire file content	cat params.txt
less filename	Open a scrollable view of the file	less results.log
head filename	Show the first 10 lines	head simulation.log
tail filename	Show the last 10 lines	tail simulation.log
tail -f filename	Continuously monitor the file (useful for live logs)	tail -f output.log

Tip: Use the arrow keys to scroll in less, and press q to quit.

Copying, Moving, and Renaming Files

When organizing your project folders, you’ll often need to duplicate, move, or rename files.

Command	Description	Example
cp file1 file2	Copy a file	cp mesh.py mesh_backup.py
cp -r folder1 folder2	Copy folders recursively	cp -r results/ archive_results/
mv file new_location	Move a file to another folder	mv beam.py /mnt/d/simulations/
mv oldname newname	Rename a file	mv params.txt parameters.txt

Deleting Files

Be cautious when deleting files — once removed, they can’t be easily recovered.

Deleting Files

Be cautious when deleting files — once removed, they can’t be easily recovered.

Command	Description	Example
rm filename	Delete a file	rm temp.log
rm -r folder	Delete a folder and its contents	rm -r old_study
rm -rf folder	Force delete a folder (use with caution)	rm -rf backup_old

Warning: The rm -rf command will permanently delete files and folders without any confirmation. Double-check your command before pressing Enter!

Useful Shortcuts

• Use Tab for filename auto-completion.
• Combine && to chain commands (e.g., touch a.txt && nano a.txt).
• Use Ctrl + C to stop an active process.
• Use Ctrl + D to exit the terminal or Nano editor.

Summary

Creating and managing files directly from the terminal makes your workflow faster, especially when handling simulations and automation scripts. You now know how to:

• Create, view, and edit files using commands like touch, cat, and nano.
• Copy, move, and rename files for better organization.

In the next section, we’ll explore how to manage file permissions and ownership, which is particularly useful when sharing projects or running simulation scripts on servers.