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

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



NAME
     su - substitute user id temporarily

SYNOPSIS
     su [ userid ]

DESCRIPTION
     _S_u demands the password of the specified _u_s_e_r_i_d, and if it
     is given, changes to that _u_s_e_r_i_d and invokes the Shell _s_h(1)
     without changing the current directory.  The user environ-
     ment is unchanged except for HOME and SHELL, which are taken
     from the password file for the user being substituted (see
     _e_n_v_i_r_o_n(5)).  The new user ID stays in force until the Shell
     exits.

     If no _u_s_e_r_i_d is specified, `root' is assumed.  To remind the
     super-user of his responsibilities, the Shell substitutes
     `#' for its usual prompt.

SEE ALSO
     sh(1)

BUGS
     Local administrative rules cause restrictions to be placed
     on who can _s_u to `root', even with the root password.  These
     rules vary from site to site.





























Printed 11/10/80            11/16/79                            1