https://github.com/harsha-yuvaraj/rapid-unix-shell

A custom Unix-based shell developed in C, designed to execute standard Unix commands like ls, grep, mkdir, and awk. It supports parallel command execution, output redirection, and robust error handling.
https://github.com/harsha-yuvaraj/rapid-unix-shell

c operating-systems shell unix

Last synced: 16 days ago
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A custom Unix-based shell developed in C, designed to execute standard Unix commands like ls, grep, mkdir, and awk. It supports parallel command execution, output redirection, and robust error handling.

• Host: GitHub
• URL: https://github.com/harsha-yuvaraj/rapid-unix-shell
• Owner: harsha-yuvaraj
• Created: 2024-10-02T02:32:25.000Z (4 months ago)
• Default Branch: main
• Last Pushed: 2025-01-03T02:14:37.000Z (about 1 month ago)
• Last Synced: 2025-01-03T03:25:00.404Z (about 1 month ago)
• Topics: c, operating-systems, shell, unix
• Language: C
• Homepage:
• Size: 41 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Rapid Unix Shell

## Project Overview

A custom Unix-based shell developed in C, designed to execute standard Unix commands like `ls`, `grep`, `mkdir`, and `awk`. It supports parallel command execution, output redirection, and robust error handling. The shell also provides built-in commands like `cd`, `path`, and `exit` for convenient navigation and process control.

## Features

- **Command Execution**: Supports Unix commands such as `cat`, `grep`, `touch`, `mkdir`, and more.

- **Parallel Execution**: Use `&` to run multiple commands in parallel.

- **Input/Output Redirection**: Redirect output to a file using the `>` operator.

- **Built-in Commands**:

  - `cd`: Change directories.

  - `path`: Manage executable search paths.

  - `exit`: Exit the shell.

- **Robust Error Handling**: Includes mechanisms for handling incorrect commands and system call failures.

- **Flexible Input Parsing**: Programmed to handle multiple spaces or tabs between commands and arguments, empty commands between parallel operators (&), and mixed use of spaces and tabs for formatting.

## Getting Started

### Prerequisites

- A Unix-based environment (Linux or macOS).

- GCC compiler (version 11.4.0 or later).

### Compilation

To compile the project, use the provided `Makefile`. Simply run:

```bash

make

```

### Running the Shell

Once compiled, start the shell by running:

```bash

./rush

```

The shell will prompt with rush>, ready to accept commands. You can execute standard Unix commands, run multiple commands in parallel, or redirect output to files.

### Examples

Here are some examples of how to use the shell:

**Single Command**: Run a simple command like ls to list directory contents:

```

rush> ls -l

```

**Output Redirection**: Redirect the output of a command to a file using the `>` operator:

```

rush> ls -l > output.txt

```

**Parallel Commands**: Run multiple commands in parallel by using the `&` operator:

```

rush> mkdir newdir & grep "text" file.txt & ls -l > output.txt

```

## Error Handling

The shell includes robust error handling for situations such as invalid commands, incorrect use of redirection, failed command execution, and more. For example: 

**Invalid Directory in cd**: If an invalid directory is provided to the cd command, an error will be displayed.

```

rush> cd nonexistentdir

An error has occurred

```