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    Command:

    setuid

    
    
    

    SYNOPSIS

           setuid username|uid   command [ args ]
    
    
    

    DESCRIPTION

           Setuid  changes  user  id, then executes the specified command.  Unlike
           some versions of su(1), this program doesn't ever ask  for  a  password
           when executed with effective uid=root.  This program doesn't change the
           environment; it only changes the uid and then uses execvp() to find the
           command  in  the  path,  and  execute it.  (If the command is a script,
           execvp() passes the command name to /bin/sh for processing.)
    
           For example,
                  setuid  some_user  $SHELL
           can be used to start a shell running as another user.
    
           Setuid is useful inside scripts that are being  run  by  a  setuid-root
           user -- such as a script invoked with super, so that the script can exe-
           cute some commands using the uid of the original user, instead of root.
           This  allows unsafe commands (such as editors and pagers) to be used in
           a non-root mode inside a super script.  For example, an  operator  with
           permission to modify a certain protected_file could use a super command
           that simply does:
                  cp protected_file temp_file
                  setuid $ORIG_USER ${EDITOR:-/bin/vi} temp_file
                  cp temp_file protected_file
           (Note: don't use this example directly.  If the temp_file  can  somehow
           be  replaced  by  another  user, as might be the case if it's kept in a
           temporary directory, there will be a race condition in the time between
           editing  the temporary file and copying it back to the protected file.)
    
    
    

    AUTHOR

           Will Deich
    
                                         local                           SETUID(1)
    
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