usage:
%s [-h] [-v] [-b blksize] [-e edition] [-i file] [-n name] dirname outfile
-h print this help
-v be verbose
-E make all warnings errors (non-zero exit status)
-b blksize use this blocksize, must equal page size
-e edition set edition number (part of fsid)
-i file insert a file image into the filesystem (requires >= 2.4.0)
-n name set name of cramfs filesystem
-p pad by
%d bytes for boot code
-s sort directory entries (old option, ignored)
-z make explicit holes (requires >= 2.3.39)
dirname root of the filesystem to be compressed
outfile output file
