#!/bin/sh

# sysi - display system information such as cpu, memory, ip...
# BETA
# (c) 2003-11-14 Tero.Karvinen <atta> iki.fi
# GNU General Public License
# http://iki.fi/karvinen

# requires: sh, grep, uname, tr

# todo: require only programs from /bin/. Test in Debian, BSD, MacOsX

function usage
{
	echo
	echo "sysi - display system information such as cpu, memory, ip..."
	echo -e "Information about localhost: \t\t\tsysi"
	echo -e "Information on a remote host trough ssh: \tsysi loginname@example.com"
	echo "(c) 2003-11-14 Tero Karvinen http://iki.fi/karvinen"
	echo 
}

function iface 	# Interface configuration info on single <79 char line
{
	IFCONFIG=`which ifconfig 2>/dev/null||echo /sbin/ifconfig`
	ROUTE=`which route 2>/dev/null||echo /sbin/route`

	IPADDR=`$IFCONFIG $1|gawk '/inet addr/{print $2}'|gawk -F: '{print $2}'`
	IPMASK=`$IFCONFIG $1|gawk '/inet addr/{print $4}'|gawk -F: '{print $2}'`
	IPROUTE="`$ROUTE -n|grep $1|gawk '/^0\.0\.0\.0/{print $2}'`"
	test -z "$IPROUTE" && IPROUTE="undefined"
	IPDNS=`gawk '/nameserver/{print $2}' /etc/resolv.conf|tr -d ' '|tr '\n' ' '`
	IPDHCP=`grep -q "generated by /sbin/dhclient-script" /etc/resolv.conf && echo "dhcp"` # bubble
	IPCONFIG="$1 $IPADDR/$IPMASK gw:$IPROUTE dns:$IPDNS $IPDHCP"	

	echo -e $IPCONFIG
}

function interfaces	 # Interface configuration for all ifaces but loopback
{
	IFCONFIG=`which ifconfig 2>/dev/null||echo /sbin/ifconfig`
	IFACES=`$IFCONFIG |gawk -- '/^\w/{ print $1}'|grep -v lo|tr '\n' ' '`
	for TMP in $IFACES
	do
		iface $TMP
	done
}

function systeminfo	# Print system information. This is the meat of sysi.
{
	#echo "12345678 *10  5678 *20 45678 *30 45678 *40 45678 *50 45678 * 60 5678 *70 456 80*"
	#CPUMHZ=`cat /proc/cpuinfo|grep -e '^cpu MHz'|gawk -F : -- '{ print int($2) " MHz"; }'|tr '\n' ' '`
	CPUMHZ=`cat /proc/cpuinfo|gawk -F: -- '/^cpu MHz/{ print int($2) " MHz"; }'|uniq -c|gawk '{ print $1 " * " $2 " MHz"}'|tr '\n' ' '`
	if [ "`grep 'cpu MHz' /proc/cpuinfo|wc -l`" -gt 1 ]; then 
	 CPUMHZ=`cat /proc/cpuinfo|gawk -F: -- '/^cpu MHz/{ print int($2) " MHz"; }'|uniq -c|gawk '{ print $1 " * " $2 " MHz"}'|tr '\n' ' '`
	else
	 CPUMHZ=`cat /proc/cpuinfo|gawk -F: -- '/^cpu MHz/{ print int($2) " MHz"; }'`
	fi
	CPUBOGOMIPS="`cat /proc/cpuinfo|gawk -F : -- '/bogomips/{ print int($2) }'` bogomips"
	CPUNAME=`cat /proc/cpuinfo|grep -e '^model name'|gawk -F : -- '{ print $2; }'`
	CPUTYPE=`uname -pm|tr ' ' '\n'|uniq|grep -v unknown|tr '\n' ' '`
	
	MEMPHYS=`gawk -F: -- '/^MemTotal/{ print int(int($2)/1000) " MB"; }' /proc/meminfo`
	DISKTOTAL=`df --local|grep -v 'Filesystem.*1K' |gawk '{total += $2; usage+=$3}; END { print int(usage/1024/1024) " GB (" int(usage/total*100) "%) used / " int(total/1024/1024) " GB total"}'`
	DISKTOTAL=`df --local|grep -v 'Filesystem.*1K' |gawk '{total+=$2}; END { print int(total/1024/1024) " GB"}'`
	DISKUSE=`df --local|grep -v 'Filesystem.*1K' |gawk '{usage+=$3}; END { print int(usage/1024/1024) " GB"}'`
	DISKPERCENT=`df --local|grep -v 'Filesystem.*1K' |gawk '{total += $2; usage+=$3}; END { print int(usage/total*100) "%"}'`

	USERSLOGGED="`w -hs |gawk -- '{ print $1 }'|uniq|wc -l|gawk -- '{ print int($1) }'`"
	USERSHOMES="`ls /home/|wc -l|gawk -- '{print int($1) }'`"
	USERCOUNT="`grep "^\w*\:\w*\:[0123456789][0123456789][0123456789]\+:" /etc/passwd|wc -l|tr -d ' '`"
	# Usercount includes disabled users, because normal user cannot read /etc/shadow
	
	echo -e "$CPUTYPE$CPUMHZ, ram $MEMPHYS. Disks $DISKTOTAL total, $DISKUSE ($DISKPERCENT) used." 
	echo -e "Users $USERSLOGGED logged in / $USERCOUNT total. "
	interfaces
}


# Main 

if [ "--help" = "$1" -o "-h" = "$1" ]; then
	usage
elif [ -n "$1" ]; then 	# -n lenght of str not zero
	cat $0|ssh $1 sh
else
	systeminfo
fi

# (c) Tero Karvinen
# email: tero.karvinen <atsign> iki.fi
# http://iki.fi/karvinen