Run the command like this: 
npx trigger.dev@latest whoami

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Options

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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.