Crear menús y diálogos con scripts bash

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

1	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

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#!/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

clear

show_menu # display memu

read_input # wait for user input

done

Le das permisos.

chmod +x systeminfo.sh

1	chmod +x systeminfo.sh

Ejecuta.

./systeminfo.sh

# O bien..

bash systeminfo.sh

./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: ——–>>

Crear menús y diálogos con scripts bash – 2/8 (System info)

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Crear menús y diálogos con scripts bash – 2/8 (System info)

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