CGPT authored NTS: overwriting files in Linux w/o manual recreation

overwriting-files-in-linux.md

📄 How to Efficiently Overwrite a File in Linux (Without Deleting First)

When updating a script or config file on a Linux system, you do not need to delete it first. Simply overwrite it using any of the following methods:

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✅ 1. Overwrite with cp (Most Common)

sudo cp new-version.py /usr/local/bin/fetch_waqi.py

This will replace the contents of the target file.

Make it executable if needed:

sudo chmod +x /usr/local/bin/fetch_waqi.py

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✅ 2. Overwrite with mv (Renaming or Moving)

sudo mv new-version.py /usr/local/bin/fetch_waqi.py

This moves (renames) the file and replaces the target.

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✅ 3. Overwrite via Shell Redirect (Quick from CLI)

sudo tee /usr/local/bin/fetch_waqi.py > /dev/null <<EOF
#!/usr/bin/env python3
print("Updated script here...")
EOF

This directly writes to the file with elevated privileges.

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✅ 4. Edit Locally, Overwrite Remotely (With VS Code or SCP)

Save your changes locally (e.g. in VS Code), then push to the server:

scp fetch_waqi.py daniel@home:/tmp/
ssh daniel@home "sudo mv /tmp/fetch_waqi.py /usr/local/bin/fetch_waqi.py && sudo chmod +x /usr/local/bin/fetch_waqi.py"

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🛠️ Bonus: Use install for One-Liners

sudo install -m 755 fetch_waqi.py /usr/local/bin/fetch_waqi.py

This copies the file and sets permissions in one go.

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✅ Summary

Method	Best Use
cp	Simple replacement
mv	Moving or renaming
tee	Quick inline edit with sudo
scp + mv	Remote workflow (esp. from VS Code)
install	Permissions + copy in one line