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使用C语言实现简易的shell,用绿色字体显示用户名、主机名和路径,红色字体显示错误信息。能判断命令是否存在。支持重定向,支持多重管道命令。

C 98.75% Makefile 1.25%

myshell's Introduction

myshell

简介

用C语言实现的一个简易的shell,能够接受用户输入的命令并执行操作,支持多重管道及重定向 程序运行后,会模拟shell用绿色字体显示当前的用户名、主机名和路径,等待用户输入命令。程序逐次读取用户输入的指令后,将指令按空格拆分成多个字符串命令,然后判断该命令的类型。若命令有误,则用红色字体打印出错误信息

  • 若为exit,则调用自定义的exit函数,向该程序进程发送terminal信号结束该进程
  • 若为cd,则判断参数,调用chdir()函数修改当前的路径,并返回相应的结果。若修改成功,则使用getcwd()函数更新当前路径
  • 若为其它命令,则先判断命令是否存在,然后再判断是否有合法的管道。若命令合法,则再执行命令,执行命令时先判断命令是否有重定向,再执行相应的操作。管道使用递归执行,支持多重管道。

功能

  • 显示当前用户名、主机名和工作路径
  • exit命令
  • cd命令
  • 判断命令是否存在
  • 执行外部命令
  • 实现输入、输出重定向
  • 递归实现多重管道

博客

本项目的具体讲解、演示已写在博客中,欢迎大家一起探讨学习。

myshell's People

Contributors

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Watchers

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myshell's Issues

灌醉谈到的一些问题

请问对于管道的实现那里,仅仅是将标准输出重定向到fds[1],紧接着又不写入任何东西就close(fds[1])是什么意思?我看的不是很明白

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