how to split a line into array in shell

Question

below script is used for drop a mail while ping dropped in network

subject="Ping failed"
Email="[email protected]"
awk '{print $1}' < b.txt | while read ip;do
    CNT=$(ping -c 1 $ip  | grep 'received' | awk -F',' '{ print $2 }' | awk '{ print $1 }')
    if [ $CNT -eq 0 ]; then
        echo "Host : $ip is down (ping failed) at $(date)"|  mail -s "$subject" $Email
    fi
done

This script is working fine. Input file has the following content..

192.2.165.1 ttcn
192.3.4.23 dct
192.3.4.24 abc

I want to split lines of this file into 0 and 1 index form like array and mail format should be

Host : $ip ttcn is down (ping failed) at $(date)"

can anyone help me to get this?

dogbane · Accepted Answer · 2014-06-03 13:41:08Z

1

To read a line into an array use read -a arr and then access the elements using ${arr[0]}, ${arr[1]} etc.

Also, you don't need to parse the output of ping to check if the host responded. Just use the exit status instead.

Here is the revised version:

while read -r -a arr
do
    ip="${arr[0]}"
    if ! ping -q -c 1 "$ip" > /dev/null
    then
        mail -s "$subject" "$email" <<< "Host $ip is down (ping failed) at $(date)"
    fi
done < b.txt

answered Jun 3, 2014 at 13:41

dogbane

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1 Comment

user216358 Over a year ago

Great! its solved me what i was looking. another query here is there any way to create excelfile for capturing the output for the same. can we do this in shell?

Barmar · Accepted Answer · 2014-06-03 12:50:09Z

1

Give multiple arguments to read, and each column will be read into the corresponding variable:

while read ip name;do
    CNT=$(ping -c 1 $ip  | awk -F',' '/received/ { split($2, a, " "); print a[1]}')
    if [ $CNT -eq 0 ]; then
        echo "Host : $ip $name is down (ping failed) at $(date)"|  mail -s "$subject" $Email
    fi
done < b.txt

answered Jun 3, 2014 at 12:50

Barmar

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user216358 Over a year ago

thanks it works for me. if I add 3 argument then what would be the split function? like 192.2.165.1 ttcn abc and mail format accordingly.

Anubhab · Accepted Answer · 2014-06-03 12:50:30Z

0

you can use awk

 echo "192.2.165.1 ttcn" | awk ' { split($0,a,"");ip=a[1]; print $ip}'

answered Jun 3, 2014 at 12:50

Anubhab

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