En el articulo anterior vimos como crear un menú simple, ahora nos toca ponerlo en marcha y ejecutar ordenes. En este caso y para que sirva de ejemplo, al anterior script le agregaremos funciones que nos aportaran información del sistema, en concreto serán:

• Información del Sistema Operativo.
• Información del Hostname y dns.
• Información de la network/red.
• Usuarios conectados actualmente.
• Últimos usuarios que estuvieron conectados.
• Información de la memoria, libre, ocupada, y el software que hace uso de ella.

 

Script de ejemplo:

Creamos un script al que llamaremos «systeminfo.sh».

nano systeminfo.sh

Copia, pega, modifica el script.

#!/bin/bash
# Menu shell script info del sistema
# Linux server / desktop.

# Define variables
LSB=/usr/bin/lsb_release

# Purpose: Display pause prompt
# $1-> Message (optional)
function pause(){
	local message="$@"
	[ -z $message ] && message="Press [Enter] key to continue..."
	read -p "$message" readEnterKey
}

# Purpose  - Display a menu on screen
function show_menu(){
    date
    echo "---------------------------"
    echo "  INFORMACION DEL SISTEMA  "
    echo "---------------------------"
	echo "1. Informacion del S.O."
	echo "2. Informacion del Hostname y dns"
	echo "3. Informacion network"
	echo "4. Usuarios conectados"
	echo "5. Ultimos usuarios conectados"
	echo "6. Informacion de la memoria"
	echo "7. Salir"
}

# Purpose - Display header message
# $1 - message
function write_header(){
	local h="$@"
	echo "---------------------------------------------------------------"
	echo "     ${h}"
	echo "---------------------------------------------------------------"
}

# Purpose - Get info about your operating system
function os_info(){
	write_header " System information "
	echo "Operating system : $(uname)"
	[ -x $LSB ] && $LSB -a || echo "$LSB command is not insalled (set \$LSB variable)"
	#pause "Press [Enter] key to continue..."
	pause
}

# Purpose - Get info about host such as dns, IP, and hostname
function host_info(){
	local dnsips=$(sed -e '/^$/d' /etc/resolv.conf | awk '{if (tolower($1)=="nameserver") print $2}')
	write_header " Hostname and DNS information "
	echo "Hostname : $(hostname -s)"
	echo "DNS domain : $(hostname -d)"
	echo "Fully qualified domain name : $(hostname -f)"
	echo "Network address (IP) :  $(hostname -i)"
	echo "DNS name servers (DNS IP) : ${dnsips}"
	pause
}

# Purpose - Network inferface and routing info
function net_info(){
	devices=$(netstat -i | cut -d" " -f1 | egrep -v "^Kernel|Iface|lo")
	write_header " Network information "
	echo "Total network interfaces found : $(wc -w <<<${devices})"

	echo "*** IP Addresses Information ***"
	ip -4 address show

	echo "***********************"
	echo "*** Network routing ***"
	echo "***********************"
	netstat -nr

	echo "**************************************"
	echo "*** Interface traffic information ***"
	echo "**************************************"
	netstat -i

	pause 
}

# Purpose - Display a list of users currently logged on 
#           display a list of receltly loggged in users   
function user_info(){
	local cmd="$1"
	case "$cmd" in 
		who) write_header " Who is online "; who -H; pause ;;
		last) write_header " List of last logged in users "; last ; pause ;;
	esac 
}

# Purpose - Display used and free memory info
function mem_info(){
	write_header " Free and used memory "
	free -m
    
    echo "*********************************"
	echo "*** Virtual memory statistics ***"
    echo "*********************************"
	vmstat
    echo "***********************************"
	echo "*** Top 5 memory eating process ***"
    echo "***********************************"	
	ps auxf | sort -nr -k 4 | head -5	
	pause
}
# Purpose - Get input via the keyboard and make a decision using case..esac 
function read_input(){
	local c
	read -p "Enter your choice [ 1 - 7 ] " c
	case $c in
		1)	os_info ;;
		2)	host_info ;;
		3)	net_info ;;
		4)	user_info "who" ;;
		5)	user_info "last" ;;
		6)	mem_info ;;
		7)	echo "Bye!"; exit 0 ;;
		*)	
			echo "Please select between 1 to 7 choice only."
			pause
	esac
}

# ignore CTRL+C, CTRL+Z and quit singles using the trap
trap '' SIGINT SIGQUIT SIGTSTP

# main logic
while true
do
	clear
 	show_menu	# display memu
 	read_input  # wait for user input
done

Le das permisos.

chmod +x systeminfo.sh

Ejecuta.

./systeminfo.sh

# O bien..

bash systeminfo.sh

 

Ejemplos de respuestas:

Red del sistema.

Usuarios en linea (en este caso tan solo el root).

Uso de la memoria incluyendo el soft o scripts instalados.

 

Continua en el siguiente articulo: ——–>>