Options often used in javac; Terminal on mac

Some notes when following UCB's CS61B

Here I list some options that may be often used in javac( to be continued):

specify a directory where .class will be put: -d Set the destination directory for class files. The directory must already exist; javac will not create it

-g
Generate all debugging information, including local variables. By default, only line number and source file information is generated

Terminal on Mac:

cd
cd ..
ls