Eu encontrei este script no artigo landscape-sysinfo para o sistema operacional Centos :
#!/bin/bash
#Simple motd script for Centos 5/6
#created by Vitalijus Ryzakovas
b='tput bold'
n='tput sgr0'
echo "Checking for system updates:"
while ps aux | grep -e [y]um > /dev/null; do echo -n .;sleep 1; done &
up='yum -e0 -d0 check-update | awk '{print $1}''
reset
echo -e "${b}Hostname:${n} 'hostname' \t\t IP address: '/sbin/ifconfig venet0:0 | grep "inet addr" | awk -F: '{print $2}' | awk '{print $1}''"
echo -e "${b}CPU load:${n} 'cat /proc/loadavg | cut -d" " -f1-3'"
echo -e "${b}Uptime:${n} 'uptime | cut -d" " -f 4-7 | cut -d"," -f1-2'"
echo -e "Free memorry: 'cat /proc/meminfo | grep MemFree | awk {'print int($2/1000)'}' MB \t\t Total memory: 'cat /proc/meminfo | grep MemTotal | awk {'print int($2/1000)'}' MB"
echo -e "${b}Available updates:${n} 'if [[ ! -n "${up}" ]]; then echo "system up-to-date"; else echo $up; fi'\n"
echo -e "Mail quere length: 'exim -bpc'"
echo -e "Proccess number: 'cat /proc/loadavg | cut -d"/" -f2| cut -d" " -f1'\n"
echo -e "${b}Active sessions:${n} 'w | tail -n +2'"
O resultado será assim:
