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Full Discussion: shell to check user is logged on
Homework and Emergencies Homework & Coursework Questions shell to check user is logged on Post 302510857 by operator on Tuesday 5th of April 2011 07:04:09 AM
Old 04-05-2011
Question shell to check user is logged on
I was given this to do,

Write a Shell script to automatically check that a specified user is logged in to the computer.
The program should allow the person running the script to specify the name of the user to be checked, the frequency in seconds at which the script should check. If a checking frequency is not specified, it should default to 60 seconds
The script should check for the specified user and if found should output a message with a “beep” or “bell” sound to the screen stating that the user is logged in. It should also output a message to a log file stating that the user is logged in and specifying the date and time.
If the user is not logged in the script should output a message without any “beep” sound to the screen stating that the user is not logged in.
The script should allow a person running the script to specify the user name on the command line and optionally, a check frequency in seconds and a third argument “q” “q” . If “q” is present as a third argument, The script should omit any output to the screen or “beep” sound but should log to a log file the message stating that the user is logged in and giving the time.

The command to run the script would be as follows:
checklogin username 30 q where “checklogin” is the script name, “username” is the name of the user, “30” is the optional frequency to check in seconds, and “q” is the optional argument to suppress screen output.
The script should check that the number of arguments supplied is between 1 and 3 and if it is not, should terminate with an error message showing the correct syntax for the command.





so far iv done this
#get username
echo "enter username"
enter username
read username
who | grep $username
#while exit status is false continue to check
while [ $? !=0 ]
do
sleep 60
done




Any help you can give finishing this would be greatly appreciated
 

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LEARN ABOUT MOJAVE

mcxquery

mcxquery(1)						    BSD General Commands Manual 					       mcxquery(1)

NAME

     mcxquery -- Managed Client (MCX) compositor query tool

SYNOPSIS

     mcxquery [options] [-user recordName] [-group recordName] [-computer spec]

	      options:

	      -o path			 Writes output to a file at the specified path.

	      -format space | tab | xml  Specifies the format of the output.

	      -computerOnly		 Ignore values for -user and -group.

	      -useCache 		 Return the cached computer settings in the local node if they are available.

	      -raw			 Dumps Directory Service data for records contributing to managed preferences.

	      -forApple 		 Convenience for specifying options when sending bug reports to Apple. Currently enables "-raw" and "-for-
					 mat xml". See usage example below.

	      -version			 Displays the current version of ManagedClient.

DESCRIPTION

     mcxquery is a utility to determine the effective managed preferences for a user logging in to a workgroup from a specific computer.

     -user	Specify the short name of the user record to read managed preferences from. If this parameter is omitted, or a value of "=" speci-
		fied, the short name of the currently logged in console user will be used.

     -group	Specify the short name of the group record to read managed preferences from. A value of "=" may be specified to mean the name of
		the workgroup (if any) chosen for the current login session.

     -computer	Specify the computer record to read managed preferences from. The computer can be specified using either an Ethernet MAC address
		(e.g. "11:22:33:44:55:66"), a Hardware UUID (e.g. "00112233-4455-6677-8899-AABBCCDDEEFF") or the short name of the computer record
		itself (e.g. "lab1_12"). If this parameter is omitted, or a value of "=" specified, the record for the current computer will be
		used.

EXAMPLES

     mcxquery -user jane -group science -computer lab1_12
	      Displays the managed preferences that would be in effect if user "jane" logged in using workgroup "science" from the computer speci-
	      fied in the "lab1_12" computer record.

     mcxquery -user jane -group science -computer 11:22:33:44:55:66
	      Displays the managed preferences that would be in effect if user "jane" logged in using workgroup "science" from a computer with an
	      Ethernet MAC address of 11:22:33:44:55:66.

     mcxquery -user = -group = -computer guest
	      Displays the managed preferences that would be in effect if the current user logged in using the current workgroup into a computer
	      not specified by any computer record (i.e. a "guest" computer).

     mcxquery -user jane -group math
	      Displays the managed preferences that would be in effect if the user "jane" logged into the "math" workgroup on the current com-
	      puter.

     mcxquery -o /tmp/report.txt -format xml -user jane
	      Writes the managed preferences that would be in effect if user "jane" logged into the current computer without a workgroup.  The
	      report is written in XML format to /tmp/report.txt.

     mcxquery -computerOnly -computer lab1_12
	      Displays the managed preferences for the computer specified in the "lab1_12" computer record only. Useful for determining managed
	      settings when computer is at login window.

     mcxquery -computerOnly -computer 00112233-4455-6677-8899-AABBCCDDEEFF
	      Displays the managed preferences for the computer with the Hardware UUID "00112233-4455-6677-8899-AABBCCDDEEFF". Supported on Mac OS
	      X 10.6 and later.

     mcxquery -forApple -o results.plist
	      Creates a plist, suitable for submitting along with bug reports to Apple, containing the managed preferences for the current user on
	      the current computer. Also includes relevant records from Directory Services. Supported on Mac OS X 10.7 and later.

SEE ALSO

     dscl(1)

MacOSX								  April 14, 2017							    MacOSX
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