Linux: Navigate Directory

By Xah Lee. Date: .
cd dirPath
Change directory
cd
Go to $HOME dir
cd ..
Go up one dir
pwd
Show the current dir
pushd
save the current dir by pushing it to a stack. (use popd to go back.)
popd
goto the dir in stack. (last dir pushd)

Many of these command's argument can be either a file name (relative to current directory), or a full path, e.g. ls /usr/local/bin