UNIX advanced environment programming-notes on basic UNIX knowledge

1.2 UNIX architecture:

Kernel: Controls hardware resources and providesProgramRunning environment.

System Call: the kernel interface.

The public function library is built on the system call. Applications can call the public function library or the system call.

 

1.3 Login

1./etc/passwd. Login Name: encryption password: Value user ID: Value group ID: Comment field: Home Directory: shell program.

 

1.4 files and directories

 

The stat and fstat functions return an information structure that contains all file attributes.