UNIX for Beginners Questions & Answers

echo "Enter the initial ip:"
read inip
echo "Enter the end ip:"
read endip
a=$(echo $inip | awk -F. '{print $4}')
b=$(echo $endip | awk -F. '{print $4}')
c=$(echo $inip | head -c10)

pingfunc ()
{
for (( i=$a; i<=$b; i++ ))
do 
if ping -c 4 $c$i
then
echo "pingable"
else
echo "not pingable"
fi
done
}
pingfunc
echo "Done"

pingfunc ()
{
for (( i=$a; i<=$b; i++ ))
do 
/bin/ping -c 1 $c$i > /dev/null 2>&1 && echo $c$i is pingable || echo no answer from $c$i
done
}

/bin/ping -c 4 -i 0.2 $c$i > /dev/null 2>&1 && echo $c$i is pingable || echo no answer from $c$i

/bin/ping -c 4 -i 0.2 $c$i > /dev/null 2>&1 && echo $c$i is pingable || echo no answer from $c$i

1) /bin/ping is the absolute path to the executable

2) The null device is typically used for disposing of unwanted output streams of a process, or as a convenient empty file for input streams. This is usually done by redirection.

3) In a Unix shell, if I want to combine stderr and stdout into the stdout stream for further manipulation, I can append the following on the end of my command: 2>&1