27-11-2012, 11:54 AM
Tutorial on Linux Basics
LinuxTutorial.pdf (Size: 905.79 KB / Downloads: 51)
Overview of Linux System
Kernel & Shell
Linux is operating system (OS).
Linux system is described as kernel &
shell.
Kernel is a main program of Linux
system.It controls hard wares, CPU,
memory, hard disk, network card etc.
Shell is an interface between user and
kernel. Shell interprets your input as
commands and pass them to kernel.
Multiuser
& Multiprocess
Many people can use one machine at the same
time.
File & Process
Data, directory, process, hard disk etc (almost
everything) are expressed as a file.
Process is an running program identified by a
unique id (PID).
Directory Structure
Files are put in a directory.
All directories are in a hierarchical structure (tree
structure).
User can put and remove any directories on the
tree.
Top directory is “/”, which is called slash or root.
Users have the own directory. (home directory)
Relative & Absolute Path
Path means a position in the directory tree.
To express a path, you can use relative path
or absolute path.
In relative path expression, the path is not
defined uniquely, depends on your current
path.
In absolute path expression, the path is
defined uniquely, does not depend on your
current path.