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simple_shell's Introduction

Simple_Shell

測試環境

  • Arch Linux KDE

C Language

setup.sh

  • 把 my_shell.c 與 child.c 自動化編譯成 my_shell 與 child

my_shell

  • 命令列提示 1092926 ms>
  • 輸入
    • hello，印出 Parent process(**pid**) is int the FOREGOUND
    • child， 在前景執行 child 執行檔（parent process 會 wait child process）
    • child &，在背景執行 child 執行檔
    • exit，結束程式
  • 函式
    • forkToChild(pid_t pid[], int status)
      • 判斷 fork() 有沒有成功
      • status 為 1 在背景執行；0 則是在前景執行
    • cleanProcess(pid_t pid[], int size)
      • 將所有在背景執行的 process 都 kill 掉

child

  • 前景執行
    • 命令列提示 1092926 child>
    • 輸入
      • hello，印出 Child process(**pid**) is in the FOREGROUND.
      • exit，結束程式
  • 背景執行
    • 沒有輸入
    • 印出 Child process(**pid**) is in the BACKGROUND.
    • 間隔 10 秒

Demo

demo

Shell Script

abc_fg.sh

  • 命令列提示 abc_fg >
  • 輸入
    • ^Z 會跳出，但不停止程式
    • hello 印出 Hello, ForeGround!
    • exit 結束程式

abc_bg.sh

  • 沒有輸入
  • 一直印出 abc_bg > Hello, BackGround! 並間隔 20 秒再印下一次

my_shell.sh

  • 命令列提示 my_shell >
  • 輸入
    • abc_fg 執行 abc_fg.sh
    • abc_bg 執行 makeBackgroundProcess

      在背後執行 abc_bg.sh 並記錄該 process 的 pid 在 pid.txt 中

    • hello 印出 Hello, MyShell!
    • exit 刪掉背景執行的 abc_bg.sh 沒有的話直接退出

Demo

demo

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