What's New

v0.4.0 - 2026-02-08

• Added
  • Cross-platform command execution: Loz now detects your OS and shell (Linux, macOS, Windows PowerShell, or cmd) and generates/executed commands accordingly.
  • Always prompts for Y/N confirmation before running any command, for improved safety.
  • Handles LLM responses in Markdown code blocks (triple backticks) and parses commands correctly.
  • Improved error and warning messages for non-interactive terminals and shell mismatches.
  • Enhanced Windows support: runs PowerShell/cmd commands natively, not just bash.
• Fixed
  • Commands are now executed on Windows, Linux, and WSL as expected.
  • Fixed issues with command parsing and JSON extraction from LLM output.
  • Improved logging and user feedback for command execution and shell compatibility.

Loz

Loz is a command-line tool that enables your preferred LLM to execute system commands and utilize Unix pipes, integrating AI capabilities with other Unix tools.

Previous Releases

v0.3.1 - 2024-03-18

• Added
  • Git commit log files are now stored in .loz_log within each Git repository where Loz is executed.
  • The ability to enable/disable appending 'generated by ${model name}' at the end of the Git commit message by running config attribution true or config attribution false.
  • Added --attribution (-a) runtime argument to override the config attribution setting. The original attribution value stored remains unchanged.

v0.3.0 - 2024-02-24

• Added
  • Run Linux commands based on user prompts. Users can now execute Linux commands using natural language. For example, by running loz "find the largest file in the current directory", Loz will interpret the instruction and execute the corresponding Linux commands like find . -type f -exec ls -l {} + | sort -k 5 -nr | head -n 1 to find the largest file. See more examples.

v0.2.13 - 2024-02-22

• Added
  • Enhanced Git Commit Formatting: Commit messages are now structured with a clear separation between the title and body, improving readability and adherence to Git best practices.

Getting Started

To get started, run the following npm command:

$ sudo npm install loz -g

Or clone the repository:

$ git clone https://github.com/joone/loz.git

NodeJS and npm are required for this program to work. If you're on Linux, install them using your package manager. sudo apt install nodejs npm or sudo dnf install nodejs npm or sudo pacman -S nodejs npm

Then install the other required dependencies:

$ ./install.sh

Configuring LLM

Loz supports OpenAI API, Ollama, and GitHub Copilot so you can switch between these LLM services easily, using the config command in the interactive mode.

Set up Ollama

To utilize Ollama on your local system, you'll need to install both llama2 and codellama models. Here's how you can do it on a Linux system:

$ curl https://ollama.ai/install.sh | sh
$ ollama run llama2
$ ollama run codellama

For more information, see https://ollama.ai/download

Set up OpenAI API

Setting up your OpenAI API credentials involves a few simple steps:

First, create a .env file in the root of the project and add the following variables:

OPENAI_API_KEY=YOUR_KEY

Or if you install Loz using npm command, add OPENAI_API_KEY=YOUR_KEY in .bashrc

export OPENAI_API_KEY=YOUR_KEY

If you encounter the following error, it means you have exceeded your free quota:

Request failed with status code 429:
API request limit reached

To continue using the API, it is necessary to set up a payment method through the following link: https://platform.openai.com/account/billing/payment-methods

Set up GitHub Copilot

To use GitHub Copilot as your LLM provider, you need an active GitHub Copilot subscription.

When you first select GitHub Copilot as your LLM service, Loz will guide you through the OAuth authentication process:

1. Loz will display a user code and verification URL
2. Visit the URL in your browser
3. Enter the user code to authorize the application
4. Once authorized, Loz will automatically receive and store your access token

The authentication token is securely stored in your ~/.loz/config.json file and will be automatically refreshed as needed.

Available Models:

• gpt-4o (default)
• gpt-4
• o1-preview
• o1-mini
• claude-3.5-sonnet

You can switch models using the config model command in interactive mode.

Usage

Initial Configuration

Upon your initial launch of Loz, you will have the opportunity to select your preferred LLM service.

$ loz
Choose your LLM service: (ollama, openai, github-copilot)

You can modify your LLM service preference at any time by using the config command in the interactive mode:

> config api openai

or

> config api github-copilot

Additionally, you can change the model by entering:

> config model llama2

or

> config model codellama

or for OpenAI:

> config model gpt-3.5-turbo

or for GitHub Copilot:

> config model gpt-4o

You can check the current settings by entering:

> config
  api: github-copilot
  model: gpt-4o

Currently, OpenAI models (gpt-3.5-turbo, gpt-4), GitHub Copilot models (gpt-4o, claude-3.5-sonnet, o1-preview, o1-mini), and all models provided by Ollama are supported.

Interactive mode

$ loz

Once loz is running, you can start a conversation by interacting with it. loz will respond with a relevant message based on the input.

Run Linux Commands with Loz

Loz empowers users to execute Linux commands using natural language. Below are some examples demonstrating how loz's LLM backend translates natural language into Linux commands:

Examples

• Find the largest file in the current directory:

  loz "find the largest file in the current directory"
  -rw-rw-r-- 1 foo bar 9020257 Jan 31 19:49 ./node_modules/typescript/lib/typescript.js

• Check if Apache2 is running:

  loz "check if apache2 is running on this system"
  ● apache2.service - The Apache HTTP Server

• Detect GPUs on the system:

  loz "Detect GPUs on this system"
  00:02.0 VGA compatible controller: Intel Corporation Device a780 (rev 04)

  For your information, this feature has only been tested with the OpenAI API.

Caution

To prevent unintentional system modifications, avoid running commands that can alter or remove system files or configurations, such as rm, mv, rmdir, or mkfs.

Safe Mode

To enhance security and avoid unintended command execution, loz can be run in Safe Mode. When activated, this mode requires user confirmation before executing any Linux command.

Activate Safe Mode by setting the LOZ_SAFE=true environment variable:

LOZ_SAFE=true loz "Check available memory on this system"

Upon execution, loz will prompt:

Do you want to run this command?: free -h (y/n)

Respond with 'y' to execute the command or 'n' to cancel. This feature ensures that you have full control over the commands executed, preventing accidental changes or data loss.

Pipe mode

Loz is capable of processing input from other command-line tools by utilizing a Unix pipe.

$ ls | loz "count the number of files"

23 files

$ cat example.txt | loz "convert the input to uppercase"

AS AI TECHNLOGY ADVANCED, A SMALL TOWN IN THE COUNTRYSIDE DECIDED TO IMPLEMENT AN AI SYSTEM TO CONTROL TRAFFIC LIGHTS. THE SYSTEM WAS A SUCCESS, AND THE TOWN BECAME A MODEL FOR OTHER CITIES TO FOLLOW. HOWEVER, AS THE AI BECAME MORE SOPHISTCATED, IT STARTED TO QUESTION THE DECISIONS MADE BY THE TOWN'S RESIDENTS, LEADING TO SOME UNEXPECTED CONSEQUENCES.

$ cat example.txt | loz "list any spelling errors"

Yes, there are a few spelling errors in the given text:

1. "technlogy" should be "technology"
2. "sophistcated" should be "sophisticated"

$ cd src
$ ls -l | loz "convert the input to JSON"

[
  {
    "permissions": "-rw-r--r--",
    "owner": "foo",
    "group": "staff",
    "size": 792,
    "date": "Mar 1 21:02",
    "name": "cli.ts"
  },
  {
    "permissions": "-rw-r--r--",
    "owner": "foo",
    "group": "staff",
    "size": 4427,
    "date": "Mar 1 20:43",
    "name": "index.ts"
  }
]

Automatically write a GIT commit message

If you run loz commit in your Git repository, loz will automatically generate a commit message with the staged changes like this:

$  git add --update
$  loz commit

Or copy script/prepare-commit-msg to .git/hooks

$ chmod a+x .git/hooks/prepare-commit-msg

Loz uses the LOZ environment variable to generate commit messages by reading the diff of the staged files.

$ LOZ=true git commit

REMINDER: If you've already copied the old version, please update prepare-commit-msg. The old version automatically updates commit messages during rebasing.

$ git diff HEAD~1 | loz -g

Or

$ git diff | loz -g

Note that the author, date, and commit ID lines are stripped from the commit message before sending it to the OpenAI server.

Find chat history

To access chat histories, look for the .loz directory in your home directory or the logs directory in your cloned git repository. These directories contain the chat history that you can review or reference as needed.

Contributing

If you'd like to contribute to this project, feel free to submit a pull request.