terraform get --help

Usage: terraform [global options] get [options] PATH

 Downloads and installs modules needed for the configuration given by
 PATH.

 This recursively downloads all modules needed, such as modules
 imported by modules imported by the root and so on. If a module is
 already downloaded, it will not be redownloaded or checked for updates
 unless the -update flag is specified.

 Module installation also happens automatically by default as part of
 the "terraform init" command, so you should rarely need to run this
 command separately.

Options:

 -update             Check already-downloaded modules for available updates
                     and install the newest versions available.

 -no-color           Disable text coloring in the output.

terraform get: [ -update | --help ]