gentoo snippets

- PostgreSQL useful commands
-- /etc/init.d/postgresql-9.6 start
-- psql -U postgres -ddb1
-- SELECT bunrui,SUM(tanka1) AS uriage,SUM(tanka2) AS shiire FROM table1 GROUP BY bunrui ORDER BY uriage DESC ;
--  \q
-- etc/init.d/postgresql-9.6 stop
- Kernel  reconfiguration commands
-- cd /usr/src/linux
--  make && make modules_install
-- make install
- install package
--  etc-update
-  rc-update add dbus default