buildctl --help

NAME:
   buildctl - build utility

USAGE:
   buildctl [global options] command [command options] [arguments...]

VERSION:
   0.11.5

COMMANDS:
   du        disk usage
   prune     clean up build cache
   build, b  build
   debug     debug utilities
   help, h   Shows a list of commands or help for one command

GLOBAL OPTIONS:
   --debug                enable debug output in logs
   --addr value           buildkitd address (default: "unix:///run/buildkit/buildkitd.sock")
   --tlsservername value  buildkitd server name for certificate validation
   --tlscacert value      CA certificate for validation
   --tlscert value        client certificate
   --tlskey value         client key
   --tlsdir value         directory containing CA certificate, client certificate, and client key
   --timeout value        timeout backend connection after value seconds (default: 5)
   --help, -h             show help
   --version, -v          print the version

buildctl [ prune | du ]