Global options

Explore Fern CLI global options.

These options work with any Fern CLI command to control logging and get help.

Option	Description	Example
`--help`	Show command help and options	`fern --help`
`--log-level`	Set logging verbosity	`fern generate --log-level debug`

Use --log-level debug to see detailed output when troubleshooting issues.

help

Use the --help option with any Fern CLI command to see an explanation and available options.

fern add --help

$ fern add --help
$ fern add <generator>
$ 
$ Add a code generator to generators.yml
$ 
$ Positionals:
$   generator                                                [string] [required]
$ 
$ Options:
$   --help     Show help                                               [boolean]
$   --log-level    [choices: "debug", "info", "warn", "error"] [default: "info"]
$   --api      Only run the command on the provided API                 [string]
$   --group    Add the generator to the specified group                 [string]

log-level

Use the --log-level option to set the verbosity of Fern’s logging output. The default level is info.

Available levels (from most to least verbose):

debug: Debug messages, informational messages, warnings, and errors
info: Informational messages, warnings, and errors
warn: Warnings and errors only
error: Error messages only

$ fern generate --log-level debug

$	fern add --help
$	fern add <generator>
$
$	Add a code generator to generators.yml
$
$	Positionals:
$	generator [string] [required]
$
$	Options:
$	--help Show help [boolean]
$	--log-level [choices: "debug", "info", "warn", "error"] [default: "info"]
$	--api Only run the command on the provided API [string]
$	--group Add the generator to the specified group [string]