Display info about users (UID GID processes terminal) Post: 302942102

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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

04-24-2015

Registered User

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

kornfan

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LEARN ABOUT NETBSD

write

WRITE(1)						    BSD General Commands Manual 						  WRITE(1)

NAME

     write -- send a message to another user

SYNOPSIS

     write user [ttyname]

DESCRIPTION

     write allows you to communicate with other users, by copying lines from your terminal to theirs.

     When you run the write command, the user you are writing to gets a message of the form:

	   Message from yourname@yourhost on yourtty at hh:mm ...

     Any further lines you enter will be copied to the specified user's terminal.  If the other user wants to reply, they must run write as well.

     When you are done, type an end-of-file or interrupt character.  The other user will see the message 'EOF' indicating that the conversation is
     over.

     You can prevent people (other than the super-user) from writing to you with the mesg(1) command.  Some commands, for example nroff(1) and
     pr(1), disallow writing automatically, so that your output isn't overwritten.

     If the user you want to write to is logged in on more than one terminal, you can specify which terminal to write to by specifying the termi-
     nal name as the second operand to the write command.  Alternatively, you can let write select one of the terminals - it will pick the one
     with the shortest idle time.  This is so that if the user is logged in at work and also dialed up from home, the message will go to the right
     place.

     The traditional protocol for writing to someone is that the string '-o', either at the end of a line or on a line by itself, means that it's
     the other person's turn to talk.  The string 'oo' means that the person believes the conversation to be over.

SEE ALSO

     mesg(1), talk(1), who(1)

HISTORY

     A write command appeared in Version 6 AT&T UNIX.

BSD
								   June 6, 1993 							       BSD

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