Operating system (OS) Linux

This section introdices a range of concepts related to Linux system programming

The term operating system is commonly used with two different meaning:

• To denote te entire package consisting of the central software managing a computer's resources and all of the ccomanying standard sodtware tools.

• More norrowly, to refer to the central software that manages and allocates computer resources (RAM, CPU, and devices)

The Shell

A Shell is a special-purpose program designed to read commands typed by a user and execute appropriate programs in response to those command, such a program is sometimes known as a command interpreter.

Some Topics

- Shell basic

• Shebang

• LTS (Long Term Support)

• RTFM (Read the F**** Manual)

• Prompt

• . and .. directories-patterns

• Main commands

  • ls, cd, pwd, rm, mkdir, cp, mv, ln, help and manpage.

• Symbolic/Soft and Hard links

Shell permissions

• chmod
• users
• groups
• command most important change owner
  • chown, su, sudo, chgrp, id, etc.
• execute files
• change owner, group and other.

Shell init files

• Local and Global variables
• Expansions
• echo
• Shell Aritmetics
• Reserved and scope variables
• Alias and unalias
• Export
• Shell printf
• Wilcards
• Special characters

Shell Redirections

• >, >>, <
• Input, Output, Error Standard
• commands
  • head, tail, wc, sort, uniq,
• filter commands
  • grep, cut, printf, find

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