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Josep Giner
Asked: 2021-11-26 07:28:34 +0800 CST 2021-11-26 07:28:34 +0800 CST

How can I do that when there is no connection, redirect those that do not give a connection to a txt?

  • 772

I have a problem and it is that I am trying to make my script when an IP of which I put a range for example: 10.0.2.0 to 10.0.2.10 and of those that are down during the script, resend them to a txt file

This is what I have

while read line
do
    echo $line
    ping -c 5 $line
    if [ $line -eq 0 ]; then
       echo "Hay conexión"
    else
       echo "No hay conexión" >> enviarip.txt
    fi
done < ip.txt 
ssmtp correo < enviarip.txt
bash

2 Answers

  1. Best Answer

    What you're doing is going pretty well. Perhaps your issue is how the command works pingand how to make it easy to exit.

    One option is to use it -c 1to send just one packet, in addition -W 1to waiting for the response for only one second:

    $ ping "$direccion" -q -c1 -W1 &> /dev/null

    In a script, it can work like this:

    #!/bin/bash

export file_encendidas='./encendidas.log'
export file_apagadas='./apagadas.log'

declare -a direcciones=(
    #[START] No existen. 
    #  Tendrían que dar error, además,
    #+ se tendrían que registrar en el archivo
    #+ "apagadas.log"
    120.0.0.1
    120.0.0.2
    120.0.0.3
    #[END] No existen

    #[START] Si exsten. 
    #  Tendrían que resultar correctas, además,
    #+ se tendrían que registrar en el archivo
    #+ "encendidas.log"
    es.stackoverflow.com
    google.com
    google.com.mx
    #[END] Si existen
)

#  Esta es la función donde ocurre la prueba 
#+ con cada dirección IP.
test_ip() {
    declare -l direccion="$1"
    
    if ping "$direccion" -q -c1 -W1 &> /dev/null
    then echo "$direccion" >> "$file_encendidas"
    else echo "$direccion" >> "$file_apagadas"
    fi
}
export -f test_ip

tr " " "\n" <<< "${direcciones[@]}" | xargs -P0 -I {} bash -c 'test_ip {}'

# Sólo para verificar el contenido
head *.log

    Resulting in:

    $ ./revisar.sh
==> apagadas.log <==
120.0.0.1
120.0.0.2
120.0.0.3

==> encendidas.log <==
google.com
google.com.mx
es.stackoverflow.com

    In your case, it is not necessary to make an array; I just did it for example purposes. Instead of an array, just feed xargsthe contents of your address file.

    • 1

  2. Ping returns an error code if it failed and 0 when all went well.

    ping -c 1 1.1.1.1 1>/dev/null 2>&1
echo $? # 0

ping -c 1 192.168.200.200 1>/dev/null 2>&1
echo $? # 2

    In this case 1>/dev/null 2>&1it is so that it does not output stdout or stderr on the screen

    • 0