Use the x-clip package to copy the content of a file to your clipboard from your the terminal. We'll go over the steps to achieve this.

Steps

1. Create a file lorem.txt and populate it with lorem-ipsum

   cat > lorem.txt << EOF
   Lorem ipsum dolor sit amet consectetur adipisicing elit. Incidunt debitis magnam
   provident nam cum alias nisi suscipit perspiciatis veritatis? Assumenda.
   EOF
   

2. Install xclip

   sudo apt install xclip
   

3. Select the file using xclip -sel c < filename

   xclip -sel c < lorem.txt
   

   -sel refers to selection and c refers to clipboard. You can run xclip -h for more info.
4. Check the content of your clipboard

   Lorem ipsum dolor sit amet consectetur adipisicing elit. Incidunt debitis magnam
   provident nam cum alias nisi suscipit perspiciatis veritatis? Assumenda.
   

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