sudo apt-get install cflow
sudo apt-get install graphviz
wget -c https://github.com/tinyclub/linux-0.11-lab/raw/master/tools/tree2dotx -O /usr/bin/tree2dotx
chmod +x /usr/bin/tree2dotx
cflow -T -m= > main.txt | tree2dotx > main.dot
cat main.dot | dot -Tsvg -o main.svg