Basic structure of Unix like system

本文介绍了一个关于Linux计算机系统的基本结构图,涵盖了内核、模块、库、Shell及应用程序等核心组成部分。通过此图,读者可以了解到Linux系统的基础架构。

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图片

 

 
  This is a simple picture about the basic structure of the linux computer system.
  It consist of some basic parts : kernel ; modules ; lib ; shell ; application .
  Of course , the parts above is not the very way to apart the system.
  There are some other pictures below :
 
   图片
### Shell Scripting in Unix/Linux Environments In Unix and Linux environments, shell scripting plays an essential role due to its versatility and portability. The shell is always accessible, making shell scripts highly portable with minimal dependencies aside from the invoked commands[^3]. Various system services utilize this shell environment extensively; many functionalities within Linux distributions are implemented as shell scripts that execute commands along with advanced features specific to shell scripting languages[^1]. #### Common Shells Leading up to Bash Before delving into writing shell scripts, it's important to understand different shells leading up to Bash such as `sh`, `csh`, `tsch`, and `ksh`. Each has unique characteristics but shares commonalities like interpreting user input and executing programs. #### Writing a Simple Shell Script A basic structure of a shell script includes defining which interpreter should process the file followed by executable statements: ```bash #!/bin/bash echo "This message will appear on screen" ``` Once written, ensure proper permissions allow execution either manually via command line or through scheduling tools like cron jobs[^4]: ```bash chmod +x myscript.sh ./myscript.sh ``` #### Portability and Maintenance Given their widespread use across various systems, understanding how these scripts function becomes crucial for administrators who often must modify them according to changing requirements. This knowledge extends beyond mere creation—it involves reading, comprehending, and adjusting existing codebases efficiently without disrupting operations.
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