From the point of view of the Linux operating system, all files are just sequences of bytes; Linux does not make any distinction between files containing human-readable text, encoded database tables or executable machine code. The Linux command line, also known as shell, has powerful mechanisms to add contents to a file. In particular, you can append additional text to a Linux file from the command line.
Log in to the computer.
Launch a shell, by either logging in to text mode or by launching a Terminal window from the graphical desktop.
Type the following command into the shell:
echo "new text" >> /home/fangulo/textFile.txt
Replace "new text" by the text you want to add to the file, and replace "/home/fangulo/textFile.txt" by the name, with the full path, of the file to which you want to add the text. Press "Enter." When the shell prompts you for a new command, the text will have been added to the file.
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