File Systems

Security, authentication, file systems. NFS and AFS

What is a soft link in a file system?

a path that is resolved to another path

What is a hard link in a file system?

a mapping of a name to a file identifier

Can two Unix processes simultaneous write to different positions in a single file?

Yes, the two processes will have their own file table entries.

What is the purpose of the Unix lseek operation?

set the read/write pointer of an opened file

How is a NFS client-side cache entry validated?

if the validity was checked less than t seconds ago or if the server modification time is equal to the client modification time

How does a NFS server know at what position to read and write to?

each read and write operation holds the position