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Full Discussion: Display info about users (UID GID processes terminal)
Homework and Emergencies Homework & Coursework Questions Display info about users (UID GID processes terminal) Post 302942102 by kornfan on Friday 24th of April 2015 08:15:30 AM
Old 04-24-2015
Display info about users (UID GID processes terminal)
I would like to get an opinion for my solution for this task and get feedback about better approach or mistakes I have made.

1. The problem statement, all variables and given/known data:
The task is to create a script which prints information about users whose names are specified in the parameters between spaces.

Result should display:
  • user name
  • UID
  • GID
  • home path
  • status (logged in or not)
  • if yes specify terminal name and number of processes running
If user is logged in to more than one terminal then it should display info about every terminal separately.

If there is no parameter specified then information displayed should concern the user who run the script


2. Relevant commands, code, scripts, algorithms:
I used simple commands:
grep ps who wc cut
to get necessary information

3. The attempts at a solution (include all code and scripts):
Code:
#!/bin/sh
if [ -z "$*" ]
then
	users=$(who)
else
	users=$*
fi
for name in $users
do
	line=$(grep "^$name:" /etc/passwd)
	if [ -z "$line" ]
	then
		echo "User not found"
	else
		 printf "$line" | cut -f 1,3,4,6 -d:
	
		if [ -n "$(who | grep $name)" ]
		then
			printf " logged in at "
			terminale=$(who | grep $name)
			terminale=`echo "$terminale" | cut -f2 -d" "`
			for terminal in $terminale
			do
				printf "%s " $(echo "$terminal" | cut -f2 -d" ")
				printf "%s processes " $(ps -t $terminal | wc -l)
			done
			printf "\n"
		else
			printf "Not logged in \n"
		fi	

	fi	
done


4. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):
Wojskowa Akademia Techniczna, Poland
Operating Systems (Systemy Operacyjne)
A.Zieliński
 

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LEARN ABOUT DEBIAN

pvm_advise

ADVISE(3PVM)							  PVM Version 3.4						      ADVISE(3PVM)

NAME

       pvm_advise() - Controls use of direct task-to-task routing.
       [In Version 3.2: Replaced by pvm_setopt]

SYNOPSIS

       C    int info = pvm_advise( int route )

       Fortran	 call pvmfadvise( route, info )

PARAMETERS

       route   Integer advising PVM to set up direct task-to-task links.
									  route options
	       PvmDontRoute	   1	Don't allow direct links to this task
	       PvmAllowDirect	   2	Allow but don't request direct links
	       PvmRouteDirect	   3	Request direct links

       info    Integer returning error status.

DESCRIPTION

       The routine pvm_advise advises PVM on whether or not to set up direct task-to-task links (using TCP) for all subsequent communication. Once
       a link is established it remains until the application finishes.  If a direct link can not be established because one of the two tasks  has
       requested  PvmDontRoute	or  because no resources are available, then the default route through the PVM daemons is used.  pvm_advise can be
       called multiple times to selectively establish direct links, but is typically set only once near the beginning of each  task.   PvmAllowDi-
       rect  is  the default advise setting.  This setting on task A allows other tasks to set up direct links to A.  Once a direct link is estab-
       lished between tasks both tasks will use it for sending messages.  pvm_advise returns the error status in info.	The performance of  direct
       task-to-task  links can be up to a factor of two better than the default route. The draw back is a lack of scalability of the direct links.
       Some versions of UNIX limit the number of links to no more than 30.

EXAMPLES

       C:
			   info = pvm_advise( PvmRouteDirect );

       Fortran:
			   CALL PVMFADVISE( PVMROUTEDIRECT, INFO )

ERRORS

       This error condition can be returned by pvm_advise

       PvmBadParam
	      giving an invalid route value.

SEE ALSO

       pvm_setopt(3PVM)

								  30 August, 1993						      ADVISE(3PVM)
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