Standard use commands in the order you may need them.
     prefetch : preload all necessary files in cache before compilation
        build : compile the distribution
        clean : erase build and log to recompile everything from scratch

Optional
 gettoolchain : optionally load from sourceforge a precompilated toolchain
		package. This solve some compilation issues on old or very
		recent distributions and save 20% of next full building time.
		If you want to use it, do it before build step

Maintainer / advanced commands
    changelog : Update doc/Changelog from CVS messages log
        check : Test if packages files are still available for download
		This is faster on http URL with --spider,but still slow on ftp
		because of real load.
   checkclean : Erase all check mark on cache directory to be able to check
		another time
         dist : Mainly produce a diff from previous version to track wich
		files have been changed
    newupdate : Add on CVS structure for new update directory and files
    rootfiles : Goal is to create update/x/ROOTFILES automatically in the
		futur. Build md5 of all included files in iso and list of
		changed or removed files (not yet fully usable at some
		packages include a compilation timestamp, so md5 change at
		every compilation)
    toolchain : Create our own toolchain package to save 20% of build time.
        shell : Enter a shell inside the chroot, used to tune lfs script
		and / or during kernel upgrade to rebuild a new .config