Gosh

Gosh is a lightweight, POSIX-compliant command-line shell implementation written in Go. It mimics the behavior of standard shells like Bash or Zsh, supporting built-in commands, external process execution, robust argument parsing, and I/O redirection.

gosh.mp4

Features

Built-in Commands

Gosh supports core shell built-ins natively:

• cd: Change the current working directory (supports ~ and absolute/relative paths).
• pwd: Print the current working directory.
• echo: Print text to standard output.
• type: Identify if a command is a builtin or an external executable (and where it is located).
• exit: Exit the shell with status code 0.

External Commands

• Executes any binary found in the system $PATH.
• Supports execution of local binaries (e.g., ./script.sh).
• Smart path resolution that handles absolute, relative, and environment-based paths.

Advanced Parsing & Quoting

• Single Quotes ('): Preserves literal values (e.g., 'file with spaces').
• Double Quotes ("): Handles strings with spaces while allowing for escaped characters.
• Complex Arguments: Correctly handles nested quotes and escaped spaces (e.g., "exe with \'single quotes\'").

I/O Redirection

Supports standard file redirection operators:

• > : Redirect standard output (overwrite).
• >>: Redirect standard output (append).
• < : Redirect standard input.
• 2>: Redirect standard error (overwrite).
• 2>>: Redirect standard error (append).

Pipelines (|)

Chaining commands together (e.g., cat file.txt | grep "search").

Autocompletion

Tab-completion for commands and file paths.

History Persistence

• Arrow key navigation (Up/Down) to cycle through previous commands.
• Saving command history to a file between sessions.

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Installation & Usage

Prerequisites

• Go (1.18 or higher)

Build and Run

1. Clone the repository:

git clone [repository](https://github.com/denisha-madhura/Gosh.git)  
cd gosh

Build the Shell:

go build -o Gosh

Run:

./Gosh

or Run the following command:

curl -fsSL https://denishamadhura.vercel.app/install.sh | bash

gosh