(on Ubuntu 10.4, tcsh):
jflex lexer.jflex setenv CLASSPATH '.:/usr/share/java/JFlex.jar' javac lexer.java tester.java java tester source.txt
(on Ubuntu 10.4, tcsh):
jflex lexer.jflex setenv CLASSPATH '.:/usr/share/java/JFlex.jar' javac lexer.java tester.java java tester source.txt