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dagger/docs/install.md

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# Installing or upgrading Dagger
## Summary
- [Installing or upgrading Dagger](#installing-or-upgrading-dagger)
- [Summary](#summary)
- [Option 1 (Mac OS only): install or upgrade from Homebrew](#option-1-mac-os-only-install-or-upgrade-from-homebrew)
- [Option 2: install or upgrade from a shell script](#option-2-install-or-upgrade-from-a-shell-script)
- [Option 3: Manually fetch the latest binary release from Github](#option-3-manually-fetch-the-latest-binary-release-from-github)
- [Option 4: Compile from source](#option-4-compile-from-source)
## Option 1 (Mac OS only): install or upgrade from Homebrew
From your Mac OS terminal, run the following command:
```shell
brew install dagger/tap/dagger
```
If dagger is already installed, you can upgrade it using this command:
```shell
brew update; brew upgrade dagger
```
> :bulb: Verify the installation with `dagger version`.
## Option 2: install or upgrade from a shell script
From a terminal, run the following command:
```shell
curl -sfL https://releases.dagger.io/dagger/install.sh | sh
```
You now have the dagger binary in the local directory under `./bin/dagger`.
You can then install it globally on your system:
```shell
sudo mv ./bin/dagger /usr/local/bin
```
> :bulb: Verify the installation with `dagger version`.
## Option 3: Manually fetch the latest binary release from Github
Open your web browser to [the latest release](https://github.com/dagger/dagger/releases/latest).
From the **assets** section, download the archive corresponding to your OS and Arch.
> :bulb: Verify the installation with `dagger version`.
## Option 4: Compile from source
You will need [Go](https://golang.org) version 1.16 or later.
1. Clone the dagger repository
```shell
git clone https://github.com/dagger/dagger.git
```
2. Build the `dagger` binary.
```shell
cd dagger; make
```
3. Copy the `dagger` tool to a location listed in your `$PATH`. For example, to copy it to `/usr/local/bin`:
```shell
cp ./cmd/dagger/dagger /usr/local/bin
```
> :bulb: Verify the installation with `dagger version`.