Provided by: login_4.1.4.2-1ubuntu2_i386 bug

NOME

       su - change user ID or become superuser

SINOSSI

       su [opzioni] [username]

DESCRIZIONE

       The su command is used to become another user during a login session.
       Invoked without a username, su defaults to becoming the superuser. The
       optional argument - may be used to provide an environment similar to
       what the user would expect had the user logged in directly.

       Dopo il nome utente, è possibile specificare argomenti aggiuntivi da
       passare alla shell di login dellutente. In particolare, molti
       interpreti di comando adottano la convenzione per cui lopzione -c
       seguita da un argomento fa sì che questultimo sia considerato un
       comando.Il comando viene eseguito dalla shell specificata in
       /etc/passwd per lutente di destinazione.

       You can use the -- argument to separate su options from the arguments
       supplied to the shell.

       Allutente viene quindi chiesta la password, se necessario. Una password
       errata viene segnalata da un messaggio derrore. Viene effettuato il log
       di tutti i tentativi, siano essi riusciti o meno, al fine di rilevare
       ogni abuso del sistema.

       The current environment is passed to the new shell. The value of $PATH
       is reset to /bin:/usr/bin for normal users, or
       /sbin:/bin:/usr/sbin:/usr/bin for the superuser. This may be changed
       with the ENV_PATH and ENV_SUPATH definitions in /etc/login.defs.

       A subsystem login is indicated by the presence of a "*" as the first
       character of the login shell. The given home directory will be used as
       the root of a new file system which the user is actually logged into.

OPZIONI

       Il comando su accetta le seguenti opzioni:

       -c, --command COMMAND
           Specify a command that will be invoked by the shell using its -c.

       -, -l, --login
           Provide an environment similar to what the user would expect had
           the user logged in directly.

           When - is used, it must be specified as the last su option. The
           other forms (-l and --login) do not have this restriction.

       -s, --shell SHELL
           The shell that will be invoked.

           The invoked shell is chosen from (highest priority first):

               The shell specified with --shell.

               If --preserve-environment is used, the shell specified by the
               $SHELL environment variable.

               The shell indicated in the /etc/passwd entry for the target
               user.

               /bin/sh if a shell could not be found by any above method.

           If the target user has a restricted shell (i.e. the shell field of
           this users entry in /etc/passwd is not listed in /etc/shell), then
           the --shell option or the $SHELL environment variable wont be taken
           into account, unless su is called by root.

       -m, -p, --preserve-environment
           Preserve the current environment, except for:

           $PATH
               reset according to the /etc/login.defs options ENV_PATH or
               ENV_SUPATH (see below);

           $IFS
               reset to «<space><tab><newline>», if it was set.

           If the target user has a restricted shell, this option has no
           effect (unless su is called by root).

           Note that the default behavior for the environment is the
           following:

               The $HOME, $SHELL, $USER, $LOGNAME, $PATH, and $IFS environment
               variables are reset.

               If --login is not used, the environment is copied, except for
               the variables above.

               If --login is used, the $TERM, $COLORTERM, $DISPLAY, and
               $XAUTHORITY environment variables are copied if they were set.

               Other environment might be set by PAM modules.

AVVISI/CAVEAT

       Questa versione di su ha molte opzioni di compilazione; solo una parte
       di esse potrebbe essere in uso su un determinato sistema.

CONFIGURATION

       The following configuration variables in /etc/login.defs change the
       behavior of this tool:

       CONSOLE_GROUPS (string)
           List of groups to add to the users supplementary groups set when
           logging in on the console (as determined by the CONSOLE setting).
           Default is none.

           Use with caution - it is possible for users to gain permanent
           access to these groups, even when not logged in on the console.

       DEFAULT_HOME (boolean)
           Indicate if login is allowed if we cant cd to the home directory.
           Default in no.

           If set to yes, the user will login in the root (/) directory if it
           is not possible to cd to her home directory.

       ENV_PATH (string)
           If set, it will be used to define the PATH environment variable
           when a regular user login. The value can be preceded by PATH=, or a
           colon separated list of paths (for example /bin:/usr/bin). The
           default value is PATH=/bin:/usr/bin.

       ENV_SUPATH (string)
           If set, it will be used to define the PATH environment variable
           when the superuser login. The value can be preceded by PATH=, or a
           colon separated list of paths (for example
           /sbin:/bin:/usr/sbin:/usr/bin). The default value is
           PATH=/bin:/usr/bin.

       SULOG_FILE (string)
           If defined, all su activity is logged to this file.

       SU_NAME (string)
           If defined, the command name to display when running "su -". For
           example, if this is defined as "su" then a "ps" will display the
           command is "-su". If not defined, then "ps" would display the name
           of the shell actually being run, e.g. something like "-sh".

       SYSLOG_SU_ENAB (boolean)
           Enable "syslog" logging of su activity - in addition to sulog file
           logging.

FILE

       /etc/passwd
           informazioni sugli account utente.

       /etc/shadow
           Informazioni sicure sugli account di utenti.

       /etc/login.defs
           Shadow password suite configuration.

VEDERE ANCHE

       login(1), login.defs(5), sg(1), sh(1).