I have already written few tips about Linux file system.
Now IBM developerworks has published excellent set of tips and howtos.
From the article:
Systems administrators can use a number of programs to maintain files in a UNIX system from the command line. In this tutorial, you'll experiment with commands, such as cd, cp, and tar, to navigate a UNIX file system from the command line and work with files and directories. The cd command changes directories, cp duplicates files or directories, and tar quickly groups files into an archive. You'll also learn how to deal with file permissions and perform simple input/output.
In this tutorial you will learn
=> Directories & Files
=> Ownership and permissions
=> Dealing with multiple files
=> Archives and compression
=> The file system and file sizes
=> Input and output etc
Read more at IBM developerworks...