• While in your gtf0 directory use the make command to build the code

make gtf0

It is also possible to compile manually

gcc -Wall --std=gnu18 -o gtf0 gtf0.c -lgd

• Using the mv command, move the resulting image from your gtf0 dir to your public html dir

mv gtf0.png ~/public_html

• To allow public viewing of the image use the chmod command

chmod 0644 ~/public_html/gtf0.png

• Finally to see the image go to https://lab46.g7n.org/~USER/gtf0.png
• Replacing USER with your username