This runs a server on your machine that can execute Trigger.dev tasks: 
npx trigger.dev@latest dev
It will first perform an update check to prevent version mismatches, failed deploys, and other errors. You will always be prompted first. You will see in the terminal that the server is running and listening for tasks. When you run a task, you will see it in the terminal along with a link to view it in the dashboard. It is worth noting that each task runs in a separate Node process. This means that if you have a long-running task, it will not block other tasks from running.

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Arguments

npx trigger.dev@latest dev [path]
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Project path
[path]
The path to the project. Defaults to the current directory.

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Options

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Config file
--config | -c
The name of the config file found at the project path. Defaults to trigger.config.ts
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Project ref
--project-ref | -p
The project ref. Required if there is no config file.
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Env file
--env-file
Load environment variables from a file. This will only hydrate the process.env of the CLI process, not the tasks.
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Skip update check
--skip-update-check
Skip checking for @trigger.dev package updates.

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Common options

These options are available on most commands.
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Login profile
--profile
The login profile to use. Defaults to “default”.
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API URL
--api-url | -a
Override the default API URL. If not specified, it uses https://api.trigger.dev. This can also be set via the TRIGGER_API_URL environment variable.
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Log level
--log-level | -l
The CLI log level to use. Options are debug, info, log, warn, error, and none. This does not affect the log level of your trigger.dev tasks. Defaults to log.
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Skip telemetry
--skip-telemetry
Opt-out of sending telemetry data. This can also be done via the TRIGGER_TELEMETRY_DISABLED environment variable. Just set it to anything other than an empty string.
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Help
--help | -h
Shows the help information for the command.
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Version
--version | -v
Displays the version number of the CLI.

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Concurrently running the terminal

Install the concurrently package as a dev dependency: 
concurrently --raw --kill-others npm:dev:remix npm:dev:trigger
Then add something like this in your package.json scripts: 
"scripts": {
  "dev": "concurrently --raw --kill-others npm:dev:*",
  "dev:trigger": "npx trigger.dev@latest dev",
  // Add your framework-specific dev script here, for example:
  // "dev:next": "next dev",
  // "dev:remix": "remix dev",
  //...
}