вот неплохой учебник
http://ru.wikibooks.org/wiki/%D0%90%D1%81%D1%81%D0%B5%D0%BC%D0%B1%D0%BB%D0%B5%D 1%80_%D0%B2_Linux_%D0%B4%D0%BB%D1%8F_%D0%BF%D1%80% D0%BE%D0%B3%D1%80%D0%B0%D0%BC%D0%BC%D0%B8%D1%81%D1 %82%D0%BE%D0%B2_C