4BSD/usr/man/cat1/passwd.1

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PASSWD(1)           UNIX Programmer's Manual            PASSWD(1)



NAME
     passwd - change login password

SYNOPSIS
     passwd [ name ]

DESCRIPTION
     This command changes (or installs) a password associated
     with the user _n_a_m_e (your own name by default).

     The program prompts for the old password and then for the
     new one.  The caller must supply both.  The new password
     must be typed twice, to forestall mistakes.

     New passwords must be at least four characters long if they
     use a sufficiently rich alphabet and at least six characters
     long if monocase.  These rules are relaxed if you are
     insistent enough.

     Only the owner of the name or the super-user may change a
     password; the owner must prove he knows the old password.

FILES
     /etc/passwd

SEE ALSO
     login(1), passwd(5), crypt(3)
     Robert Morris and Ken Thompson, _U_N_I_X _p_a_s_s_w_o_r_d _s_e_c_u_r_i_t_y

BUGS
     The password file information should be kept in a different
     data structure allowing indexed access; _d_b_m(3) would prob-
     ably be suitable.






















Printed 11/10/80                                                1