Bash/sh/zsh one liners, append to a file with sudo

one-liners-append-to-file.sh

# 1. One liner, append to a file
echo "A new line at the end of the file" >> file.txt

# 2. One liner, append to a file including newlines
echo -e "\n\nA new line at the end of the file that is preceeded by some new lines" >> file.txt

# 3. One liner, append to a file the requires sudo
echo "A new line at the end of the file that requires sudo" | sudo tee -a /etc/fstab

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Related

# 4. Overwrite a file
echo "A new line at the end of the file" > file.txt