1arduino-cli board attach [-p <port>] [-b <FQBN>] [-P <programmer>] [sketchPath] [flags]

1arduino-cli board attach -p /dev/ttyACM0
2  arduino-cli board attach -p /dev/ttyACM0 HelloWorld
3  arduino-cli board attach -b arduino:samd:mkr1000  arduino-cli board attach -P atmel_ice

1--board-options strings        List of board options separated by commas. Or can be used multiple times for multiple options.
2      --discovery-timeout duration   Max time to wait for port discovery, e.g.: 30s, 1m (default 1s)
3  -b, --fqbn string                  Fully Qualified Board Name, e.g.: arduino:avr:uno
4  -h, --help                         help for attach
5  -p, --port string                  Upload port address, e.g.: COM3 or /dev/ttyACM2
6  -P, --programmer string            Programmer to use, e.g: atmel_ice
7  -l, --protocol string              Upload port protocol, e.g: serial

1--additional-urls strings   Comma-separated list of additional URLs for the Boards Manager.
2      --config-dir string         Sets the default data directory (Arduino CLI will look for configuration file in this directory).
3      --config-file string        The custom config file (if not specified the default will be used).
4      --json                      Print the output in JSON format.
5      --log                       Print the logs on the standard output.
6      --log-file string           Path to the file where logs will be written.
7      --log-format string         The output format for the logs, can be: text, json (default "text")
8      --log-level string          Messages with this level and above will be logged. Valid levels are: trace, debug, info, warn, error, fatal, panic (default "info")
9      --no-color                  Disable colored output.