Installation on Debian
mkdir schemaSpy
cd schemaSpy
wget http://ovh.dl.sourceforge.net/sourceforge/schemaspy/schemaSpy_3.1.1.jar
sudo apt-get install libpg-java graphviz gsfonts
java -jar ./schemaSpy_3.1.1.jar -cp /usr/share/java/postgresql.jar -t pgsql -host localhost -u dpavlin \
  -db pagila -s public -o ~/public_html/pagila/