/usr/bin/ldappasswd

/usr/bin/ldappasswd: invalid option -- '-'
ldappasswd: unrecognized option --
Change password of an LDAP user

usage: ldappasswd [options] [user]
  user: the authentication identity, commonly a DN
Password change options:
  -E         bind early
  -a secret  old password
  -A         prompt for old password
  -t file    read file for old password
  -s secret  new password
  -S         prompt for new password
  -T file    read file for new password
Common options:
  -d level   set LDAP debugging level to `level'
  -D binddn  bind DN
  -e [!]<ext>[=<extparam>] general extensions (! indicates criticality)
             [!]assert=<filter>     (RFC 4528; a RFC 4515 Filter string)
             [!]authzid=<authzid>   (RFC 4370; "dn:<dn>" or "u:<user>")
             [!]bauthzid            (RFC 3829)
             [!]chaining[=<resolveBehavior>[/<continuationBehavior>]]
                     one of "chainingPreferred", "chainingRequired",
                     "referralsPreferred", "referralsRequired"
             [!]manageDSAit         (RFC 3296)
             [!]noop
             ppolicy
             [!]postread[=<attrs>]  (RFC 4527; comma-separated attr list)
             [!]preread[=<attrs>]   (RFC 4527; comma-separated attr list)
             [!]relax
             [!]sessiontracking[=<username>]
             abandon, cancel, ignore (SIGINT sends abandon/cancel,
             or ignores response; if critical, doesn't wait for SIGINT.
             not really controls)
  -H URI     LDAP Uniform Resource Identifier(s)
  -I         use SASL Interactive mode
  -n         show what would be done but don't actually do it
  -N         do not use reverse DNS to canonicalize SASL host name
  -O props   SASL security properties
  -o <opt>[=<optparam>] any libldap ldap.conf options, plus
             ldif_wrap=<width> (in columns, or "no" for no wrapping)
             nettimeout=<timeout> (in seconds, or "none" or "max")
  -Q         use SASL Quiet mode
  -R realm   SASL realm
  -U authcid SASL authentication identity
  -v         run in verbose mode (diagnostics to standard output)
  -V         print version info (-VV only)
  -w passwd  bind password (for simple authentication)
  -W         prompt for bind password
  -x         Simple authentication
  -X authzid SASL authorization identity ("dn:<dn>" or "u:<user>")
  -y file    Read password from file
  -Y mech    SASL mechanism
  -Z         Start TLS request (-ZZ to require successful response)