Solution 1

• Program Code
• Program Config File
• Program Output

# File: /dolomite/home/kscott/class/cs209-sysadmin/ass1/kscott.sh
# Author: K. Scott Rowe
# Time-stamp: <02/26/2000 18:35:21 cs209@rainbow>

#kscott Feb  6 2000: 
# finger doesn't return an error code if "connection refused"
# rusers is not setup on linux
# rup only returns #users when linux-to-linux
# one-ping-only syntax is different on SunOS and Linux
# rup on solaris seperates loads with a space, linux uses commas and a space


MAILTO="cs209" ; export MAILTO	#who gets the mail
CONF_FILE="kscott.cfg" ; export CONF_FILE    # machines to check
OSTYPE="`uname -s`" ; export OSTYPE    # use for OS differences
TMP_FILE=/tmp/$0.$$ ; export TMP_FILE  # temp file to write things to
PATH=/sbin:/usr/sbin:/usr/ucb:/bin:/usr/bin:/usr/local/bin ; export PATH

MyPing()			# ping acts differently on different OS's
{
    if [ "$OSTYPE" = "SunOS" ] ; then
        ping $1 1 > /dev/null 2>&1
    elif [ "$OSTYPE" = "Linux" ] ; then
        ping -c 1 $1 > /dev/null 2>&1
    else 
	echo "$0: Unknown OS type ($OSTYPE)" 
	exi 1
    fi
    [ "$?" = "0" ] && return 0 || return 1
}

MyFinger()			# finger doesn't return error codes
{
    # compare stderr to see if finger fails
    if [ "`finger @$1 2>&1 1> /dev/null`" != "" ] ; then
	return 1		#failure
    else			# if it didnt fail, run it for real this time
	# skip first two lines, and remove leading white space from wc output
        users="`finger @$1 | tail +3 | wc -l | awk '{print $1}'`"
	return 0		#users is already set
    fi
}

#### here is where the main program starts #####

cp /dev/null $TMP_FILE		# truncate temp file
printf "%-22.22s\tPing\tUsers\tLoad Average\n\n" "Machine Name" >> $TMP_FILE

for x in `cat $CONF_FILE` ; do	#iterate over machines in cfg file
    MyPing $x
    if [ "$?" = "0" ] ; then	#check return code to see if ping worked
        ping="up"
	MyFinger $x		#sets a global variable users (no -1 ret code)
	if [ "$?" = "0" ] ; then    # if finger worked, try rup too
	    load="`rup $x 2> /dev/null | sed -ne 's/^.*average: \([^ ,]*\)[ ,].*$/\1/p'`"
	else
	    users=""		#finger didn't work
	    load=""		#so rup probably wont either
	fi
    else			#if no ping, nothing else wiil work either
	ping=""
        users=""
        load=""
    fi
    printf "%-22.22s\t$ping\t$users\t$load\n" "$x" >> $TMP_FILE    # print our results
done

mail -s "Up Stats" ${MAILTO} < $TMP_FILE 2> /dev/null 2>&1 #mail out our results

rm $TMP_FILE			#clean up after ourselves

rainbow.nmt.edu
yellow.nmt.edu
winlm.nmt.edu
cobra.nmt.edu

Machine Name            Ping    Users   Load Average
 
rainbow.nmt.edu         up      16      1.34
yellow.nmt.edu
winlm.nmt.edu           up
cobra.nmt.edu           up      9       0.00