Install, upgrade, or remove software

As described in the Quick start, you can download and install the latest version of the DFINITY Canister smart contract SDK package by running a command in a terminal shell. The topics in this section provide additional information about installing, upgrading, and removing the DFINITY Canister SDK.

Install the latest directly from a terminal

To download and install from a terminal shell:

  1. Open a terminal shell on your local computer.

    For example, on macOS open the Applications folder, then open Utilities and double-click Terminal.

  2. Download and install the SDK package by running the following curl command:

    sh -ci "$(curl -fsSL https://sdk.dfinity.org/install.sh)"

Install a specific version from a terminal

If you want to install a specific version, for example, to test against a previous version, you can modify the installation command to include a version.

To download and install a specific version from a terminal shell:

  1. Open a terminal shell on your local computer.

  2. Set the DFX_VERSION environment variable to the version of the DFINITY Canister SDK package you want to install as a prefix to curl command.

    For example, to install version 0.8.3, you would run the following command:

    DFX_VERSION=0.8.3 sh -ci "$(curl -fsSL https://sdk.dfinity.org/install.sh)"
If you are using the DFX_VERSION environment variable to install a version of the DFINITY Canister SDK not yet publicly available, see this article for an overview of what’s changed.

What gets installed

The DFINITY Canister SDK installation script installs several components in default locations on your local computer. The following table describes the development environment components that the installation script installs:

Component Description Default location

dfx

DFINITY execution command-line interface (CLI)

/usr/local/bin/dfx

moc

Motoko runtime compiler

~/.cache/dfinity/versions/<VERSION>/moc

replica

Internet Computer local network binary

~/.cache/dfinity/versions/<VERSION>/replica

uninstall.sh

Script to remove the DFINITY Canister SDK and all of its components

~/.cache/dfinity

versions

Cache directory that contains a subdirectory for each version of the DFINITY Canister SDK you install.

~/.cache/dfinity/versions

Core components in a versioned directory

The ~/.cache/dfinity/versions directory stores one or more versioned subdirectories of the DFINITY Canister SDK. Each versioned subdirectory contains the all of the directories and files required for a specific version of the DFINITY Canister SDK. For example, if you list the contents of the ~/.cache/dfinity/versions/0.8.3 directory you would see the following core components:

total 349192
drwxr-xr-x  17 pubs  staff       544 Mar 15 11:55 .
drwxr-xr-x   4 pubs  staff       128 Mar 25 14:36 ..
drwxr-xr-x  49 pubs  staff      1568 Mar 15 11:55 base
drwxr-xr-x  20 pubs  staff       640 Mar 15 11:55 bootstrap
-r-x------   1 pubs  staff  66253292 Mar 15 11:55 dfx
-r-x------   1 pubs  staff  10496256 Dec 31  1969 ic-ref
-r-x------   1 pubs  staff   5663644 Dec 31  1969 ic-starter
-r-x------   1 pubs  staff      9604 Dec 31  1969 libcharset.1.0.0.dylib
-r-x------   1 pubs  staff     38220 Dec 31  1969 libffi.7.dylib
-r-x------   1 pubs  staff    668300 Dec 31  1969 libgmp.10.dylib
-r-x------   1 pubs  staff    958248 Dec 31  1969 libiconv.2.4.0.dylib
-r-x------   1 pubs  staff      4200 Dec 31  1969 libiconv.dylib
-r-x------   1 pubs  staff     96900 Dec 31  1969 libz.1.2.11.dylib
-r-x------   1 pubs  staff  15417684 Dec 31  1969 mo-doc
-r-x------   1 pubs  staff  14634020 Dec 31  1969 mo-ide
-r-x------   1 pubs  staff  15111508 Dec 31  1969 moc
-r-x------   1 pubs  staff  49404128 Dec 31  1969 replica

Motoko base directory

The base directory in the versioned subdirectory of the DFINITY Canister SDK contains the Motoko base library modules that are compatible with that version of the DFINITY Canister SDK. Because the Motoko base library is evolving rapidly, you should only use the base modules that are packaged with the version of the DFINITY Canister SDK that you have installed.

Bootstrap directory

The bootstrap directory contains web server code that is deprecated. Beginning with version 0.7.0, agents can call an HTTP middleware server instead of the bootstrap code. This change enables canisters to respond to HTTP requests directly and operate more like traditional web-based applications.

Upgrading to the latest version

If a new version of the DFINITY Canister SDK is available for download after your initial installation, you should install the updated version at your earliest convenience to get the latest fixes and enhancements as soon as possible. You can use the dfx upgrade command to compare the version you have currently installed against the latest version available for download. If a newer version of dfx is available, the dfx upgrade command automatically downloads and installs the latest version.

Note that you don’t need to uninstall the software before installing the new version. However, if you want to perform a clean installation rather than an upgrade, you can first uninstall the software as described in Removing the software, then re-run the download and installation command.

For information about the features and fixes in the latest release, see the Release notes.

Removing the software

When you install the DFINITY Canister SDK, the installation script puts the required binary files in a local directory and creates a cache. You can remove the SDK binaries and cache from your local computer by running the uninstall script located in the .cache folder.

For example:

~/.cache/dfinity/uninstall.sh

If you are uninstalling because you want to immediately reinstall a clean version of dfx, you can run the following command:

~/.cache/dfinity/uninstall.sh && sh -ci "$(curl -sSL https://sdk.dfinity.org/install.sh)"