date >> teste.txt
cat hosts.txt |  while read output
do   ping -c 10 -i 1 "$output" >> teste.txt
done
date >> teste.txt

command &
command &
wait

command > "${tmp1}" &
command > "${tmp2}" &
wait
cat "${tmp1}" "${tmp2}" >> "${main}"
rm -f "${tmp1}" "${tmp2}"

date >> teste.txt
cat hosts.txt |  parallel -j0 ping -c 10 -i 1 {} >> teste.txt
date >> teste.txt