Customized Shell with Go

customized_shell is a simple command-line shell implemented in Go. It supports basic built-in commands like cd, echo, pwd, type, and exit, as well as executing external commands available in the system's PATH.

Features

• Built-in commands: cd, echo, pwd, type, and exit
• Executes external commands found in the system's PATH
• Handles user input interactively
• Provides error messages for invalid commands and arguments

Usage

Building and Running the Shell

1. Clone the repository:

   git clone https://github.com/yourusername/customized_shell.git
   cd customized_shell

2. Build and run the shell using the provided script:

   ./customized_shell.sh

Commands

• cd [directory]: Change the current directory to the specified directory. Use ~ to navigate to the home directory.
• echo [args...]: Print the arguments to the standard output.
• pwd: Print the current working directory.
• type [command]: Display whether the command is a shell builtin or an external command, and show the path for external commands.
• exit [0]: Exit the shell. Only exit 0 is considered a valid exit command.

Example Usage

$ cd ~
$ pwd
/home/user
$ echo Hello, World!
Hello, World!
$ type cd
cd is a shell builtin
$ ls -l
total 8
drwxr-xr-x 2 user user 4096 Jun 18 15:07 cmd
drwxr-xr-x 2 user user 4096 Jun 18 15:07 internal
-rwxr-xr-x 1 user user  102 Jun 18 15:07 customized_shell.sh
-rw-r--r-- 1 user user  258 Jun 18 15:07 go.mod
$ exit 0

Development

Prerequisites

• Go 1.16 or later

Building from Source

To build the project from source without using the provided script:

cd cmd
go build -o ../customized_shell
../customized_shell

Testing

To run the automated tests, use the following command:

go test ./...

To see test coverage, use:

go test -cover ./...

By adding automated tests, you can ensure that your code behaves as expected and catch any regressions early in the development process.

Contributing

Contributions are welcome! Please open an issue or submit a pull request with any improvements or bug fixes.