Usage: grub-mkpasswd-pbkdf2 [OPTION...] [OPTIONS]
Generate PBKDF2 password hash.

  -c, --iteration-count=NUM  Number of PBKDF2 iterations
  -l, --buflen=NUM           Length of generated hash
  -s, --salt=NUM             Length of salt
  -?, --help                 give this help list
      --usage                give a short usage message
  -V, --version              print program version

Mandatory or optional arguments to long options are also mandatory or optional
for any corresponding short options.

Report bugs to <bug-grub@gnu.org>.