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� Write a shell script that upon invocation shows the time and date and lists all the logged-in user

help me

LEARN ABOUT PLAN9

uptime

UPTIME(1)							   User Commands							 UPTIME(1)

NAME

       uptime - Tell how long the system has been running.

SYNOPSIS

       uptime [options]

DESCRIPTION

       uptime  gives  a one line display of the following information.	The current time, how long the system has been running, how many users are
       currently logged on, and the system load averages for the past 1, 5, and 15 minutes.

       This is the same information contained in the header line displayed by w(1).

       System load averages is the average number of processes that are either in a runnable or uninterruptable state.	A process  in  a  runnable
       state is either using the CPU or waiting to use the CPU.  A process in uninterruptable state is waiting for some I/O access, eg waiting for
       disk.  The averages are taken over the three time intervals.  Load averages are not normalized for the number of CPUs in  a  system,  so  a
       load average of 1 means a single CPU system is loaded all the time while on a 4 CPU system it means it was idle 75% of the time.

OPTIONS

       -p, --pretty
	      show uptime in pretty format

       -h, --help
	      display this help text

       -s, --since
	      system up since, in yyyy-mm-dd HH:MM:SS format

       -V, --version
	      display version information and exit

FILES

       /var/run/utmp
	      information about who is currently logged on

       /proc  process information

AUTHORS

       uptime was written by Larry Greenfield <greenfie@gauss.rutgers.edu> and Michael K. Johnson <johnsonm@sunsite.unc.edu>

SEE ALSO

       ps(1), top(1), utmp(5), w(1)

REPORTING BUGS

       Please send bug reports to <procps@freelists.org>

procps-ng							   December 2012							 UPTIME(1)