Provided by: login_4.1.4.2+svn3283-3ubuntu2_i386 bug


       su - change user ID or become superuser


       su [flaggor] [anv"andarnamn]


       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.

       Additional arguments may be provided after the username, in which case
       they are supplied to the user's login shell. In particular, an argument
       of -c will cause the next argument to be treated as a command by most
       command interpreters. The command will be executed by the shell
       specified in /etc/passwd for the target user.

       Du kan anvanda argumentet -- for att separera flaggorna till su fran de
       argument som skickas till skalet.

       Anvandaren kommer att fragas efter ett losenord, om det ar lampligt.
       Ogiltiga losenord kommer att ge ett felmeddelande. Alla forsok, bade
       giltiga och ogiltiga, loggas for att detektera misskotsel av systemet.

       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.


       Flaggorna som galler for kommandot su ar:

       -c, --command COMMAND
           Ange ett kommando som ska startas av skalet med -c.

       -, -l, --login
           Tillhandahall en miljo som liknar den som anvandaren skulle
           forvanta sig om anvandaren loggat in direkt.

           Nar - anvands maste den anges som den sista flaggan for su. De
           andra formerna (-l och --login) har inte denna restriktion.

       -s, --shellSKAL
           Skalet som ska startas.

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

               Skalet angivet med --shell.

               Om --preserve-environment anvands, anges skalet med
               miljovariabeln $SHELL.

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

               /bin/sh om ett skal inte kunde hittas med nagon ovanstaende

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

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

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

               reset to "<space><tab><newline>", if it was set.

           Om malanvandaren har ett begransat skal har denna flagga ingen
           effekt (savida inte su har startats av root).

           Note that the default behavior for the environment is the

               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 environments might be set by PAM modules.


       Denna version av su har manga kompileringsflaggor, kanske bara nagra
       anvands pa specifika system.


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

       CONSOLE_GROUPS (string)
           List of groups to add to the user's 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 can't 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

       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



           Saker anvandarkontoinformation.

           Shadow password suite configuration.


       On success, su returns the exit value of the command it executed.

       If this command was terminated by a signal, su returns the number of
       this signal plus 128.

       If su has to kill the command (because it was asked to terminate, and
       the command did not terminate in time), su returns 255.

       Some exit values from su are independent from the executed command:

           success (--help only)

           System or authentication failure

           The requested command was not found

           The requested command could not be executed


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

Anvandarkommandon                 24-06-2011                             SU(1)