OS_Java_Shell

Operating Systems Course Project: Creating A Shell Interface Using Java

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Part 1

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• Implement Shell With No Commands
• Use ProcessBuilder Class To Create External Processes

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Part 2

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• Implement [cd] Command -> Change Directory

  [cd] Command MUST Include...

    [cd]
    -> Change To Home Directory
  
    [cd ~]
    -> Change To Home Directory
  
    [cd .]
    -> Stay At Current Directory
  
    [cd ..]
    -> Ascend One Directory
  
    [cd ../../..]
    -> Ascend Multiple (nth) Directories
  
    [cd /]
    -> Change To Root Directory 
  

• ArrayList Data Structure Used To Decompose And Pass Commands To ProcessBuilder

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Part 3

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• Implement History Feature

  History Feature Located In Program As "History Utilities"

    [history]
    -> Displays Commmand History In Numerical Order
  
    [!!]
    -> Runs Previous Command
  
    [!i]
    -> Runs ith Command In History (Ex. !3 Runs 3rd Command)
  

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Extra Commands Added For Fun

• [ls] -> List All Files And Directories Within Current Directory
• [cp] -> Copy One File To Another. If File Recipient Does Not Exist, Creates File
• [cat] -> Reads File To Console
• [cd] -> "cd" Is A Requirement, However I Added The Ability To Change Into Any Valid Directory