Replacing IP with server name in fping output - bash

Question

I have a txt with a list of IP that I would like to check using fping, and then translate IP into name.
My file (hosts.txt) looks like this:
192.168.1.1 serverA
192.168.1.2 serverB
192.168.1.3 serverC
and this is the script I have written:
#! /bin/bash
N_Hosts=$(wc hosts.txt | awk {'print $1'})
typeset Nodos[$N_Hosts]
i=0;
while read line
do
Nodos[$i]=$(echo $line | awk {'print $1'})
i=$i+1
done < hosts.txt
comando="fping "
comandoCompleto=$comando${Nodos[*]}
$comandoCompleto | sed 's/is alive/OK/g' | sed 's/is unreachable/down/g'
Its output is like:
192.168.1.1 OK
192.168.1.2 down
192.168.1.3 OK
And I would like it to be:
serverA OK
serverB down
serverC OK
Is it possible to change the output using sed or awk?

Answer 1

If you have two files, your hosts.txt and output.txt (output from script) then you can do:
awk 'NR==FNR{a[$1]=$2;next}{$1=a[$1]}1' hosts.txt output.txt

Answer 2

Entirely in awk (I think this requires gawk)
gawk '
{
name[$1] = $2
ips = ips " " $1
}
END {
while ((("fping" ips) | getline) != 0) {
if ($3 == "alive")
print name[$1] " OK"
else if ($3 == "unreachable")
print name[$1] " down"
}
}
' hosts.txt
or entirely with bash version 4
declare -a ips
declare -A names
while read ip name; do
ips+=($ip)
names[$ip]=$name
done < hosts.txt
fping "${ips[#]}" |
while read ip _ status; do
case $status in
alive) echo ${names[$ip]} OK ;;
unreachable) echo ${names[$ip]} down ;;
esac
done

Answer 3

GNU sed
sed -r 's#(\S+)\s+(\S+)#/\1/s/(\\S+)\\s+(\\S+)/\2 \\2/#' hosts.txt|sed -rf - output.txt
..output:
serverA OK
serverB down
serverC OK

Answer 4

It sounds like all you need is:
while read ip name
do
fping "$ip" |
awk -v n="$name" '{print n, (/alive/?"OK":"down")}'
done < hosts.txt