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+Usage example:
+
+```v
+module main
+
+import os
+import cli
+
+fn main() {
+ mut app := cli.Command{
+ name: 'example-app'
+ description: 'example-app'
+ execute: fn (cmd cli.Command) ? {
+ println('hello app')
+ return
+ }
+ commands: [
+ cli.Command{
+ name: 'sub'
+ execute: fn (cmd cli.Command) ? {
+ println('hello subcommand')
+ return
+ }
+ },
+ ]
+ }
+ app.setup()
+ app.parse(os.args)
+}
+```