


      SSSSUUUU((((1111))))                       ((((UUUUNNNNIIIIXXXX 5555....0000))))                      SSSSUUUU((((1111))))



      NNNNAAAAMMMMEEEE
           su - become super-user or another user

      SSSSYYYYNNNNTTTTAAAAXXXX
           ssssuuuu [ ---- ] [ name [ arg ... ] ]

      DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
           _S_u allows you to become another user without logging off.
           The default user _n_a_m_e is rrrrooooooootttt (i.e., super-user).

           To use _s_u, the appropriate password must be supplied (unless
           one is already super-user).  If the password is correct, _s_u
           will execute a new shell with the user ID set to that of the
           specified user.  To restore normal user ID privileges, type
           an EEEEOOOOFFFF to the new shell.

           Any additional arguments are passed to the shell, permitting
           the super-user to run shell procedures with restricted
           privileges (an _a_r_g of the form ----cccc _s_t_r_i_n_g executes _s_t_r_i_n_g via
           the shell).  When additional arguments are passed, ////bbbbiiiinnnn////sssshhhh
           is always used.  When no additional arguments are passed, _s_u
           uses the shell specified in the password file.

           An initial ---- flag causes the environment to be changed to
           the one that would be expected if the user actually logged
           in again.  This is done by invoking the shell with an _a_r_g_0
           of ----ssssuuuu causing the ....pppprrrrooooffffiiiilllleeee in the home directory of the new
           user ID to be executed.  Otherwise, the environment is
           passed along with the possible exception of $$$$PPPPAAAATTTTHHHH, which is
           set to ////bbbbiiiinnnn::::////eeeettttcccc::::////uuuussssrrrr////bbbbiiiinnnn for root.  Note that the ....pppprrrrooooffffiiiilllleeee
           can check _a_r_g_0 for ----sssshhhh or ----ssssuuuu to determine how it was
           invoked.

      FFFFIIIILLLLEEEESSSS
           /etc/passwd         system's password file
           $HOME/....profile      user's profile

      SSSSEEEEEEEE AAAALLLLSSSSOOOO
           env(1), login(1), sh(1), environ(5).

      NNNNOOOOTTTTEEEESSSS
           When one does an _s_u, the current directory is not searched.
           This protects the su'ed user from randomly executing
           programs in user directories that may have the same name as
           common system utilities.










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