How to expand who command? Post: 302448936

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LEARN ABOUT LINUX

runlevel

runlevel(8)						      System Manager's Manual						       runlevel(8)

NAME

       runlevel - output previous and current runlevel

SYNOPSIS

       runlevel [OPTION]...  [UTMP]

DESCRIPTION

       runlevel  reads	the  system UTMP file, which defaults to /var/run/utmp when no alternate filename is given, to locate the most recent run-
       level record.

       The previous and current runlevel from that record are output separated by a single space.  If there is no previous runlevel in the record,
       the letter N will be substituted.

       If no runlevel record can be found, runlevel outputs the word unknown and exits with an error.

       During  system  boot,  the  environment variables RUNLEVEL and PREVLEVEL will be set by the init(8) daemon, these come from the runlevel(7)
       event generated by telinit(8) or shutdown(8).

       When these environment variables are set, runlevel will output the values from these instead.  Thus runlevel can be used in rc scripts as a
       replacement for the System-V who(1) -r command.

OPTIONS

       --quiet
	      Does  not  output the current and previous runlevel, nor does it output unknown in the case of error (but it will exit with an error
	      code).

	      This may be used to test for the presence of a runlevel entry, or to check for errors reading from the file.

EXIT STATUS

       runlevel will exit with status 0 if a UTMP record was found, otherwise it will exit with status 1.

ENVIRONMENT

       RUNLEVEL
	      runlevel will read the current runlevel from this environment variable if set in preference to reading from /var/run/utmp

       PREVLEVEL
	      runlevel will read the previous runlevel from this environment variable if RUNLEVEL
	       was given, in preference to reading from /var/run/utmp

FILES

       /var/run/utmp
	      Where the current and previous runlevels will be read from.

NOTES

       The Upstart init(8) daemon does not keep track of runlevels itself, instead they are implemented entirely by its userspace tools.

       A change of runlevel is signalled by the runlevel(7) event, generated by either the telinit(8) or shutdown(8) tools.  This  event  includes
       the  new  runlevel  in  the  RUNLEVEL  environment  variable, as well as the previous runlevel (obtained from their own environment or from
       /var/run/utmp) in the PREVLEVEL variable.

       As well as generating the event, both tools write the new runlevel back to /var/run/utmp and append a new entry to /var/log/wtmp.

AUTHOR

       Written by Scott James Remnant <scott@netsplit.com>

REPORTING BUGS

       Report bugs at <https://launchpad.net/upstart/+bugs>

COPYRIGHT

       Copyright (C) 2009 Canonical Ltd.
       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

SEE ALSO

       runlevel(7) init(8) telinit(8) shutdown(8) who(1)

Upstart 							    2009-07-09							       runlevel(8)