Bash ping script file for checking host availability

I am trying to write a bash script in a file that would, when run start pinging a host until it becomes available, when the host becomes reachable it runs a command and stops executing, I tried writing one but the script continues pinging until the count ends,

Plus I need to put that process in the background but if I run the script with the dollar ($) sign it still runs in foreground,

ping -c30 -i3
if [ $? -eq 0 ]
then /root/scripts/
exit 0
else echo “fail”


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Method 1

I would use this, a simple one-liner:

while ! ping -c1 HOSTNAME &>/dev/null; do echo "Ping Fail - `date`"; done ; echo "Host Found - `date`" ; /root/scripts/

Replace HOSTNAME with the host you are trying to ping.

I missed the part about putting it in the background, put that line in a shellscript like so:


while ! ping -c1 $1 &>/dev/null
        do echo "Ping Fail - `date`"
echo "Host Found - `date`"

And to background it you would run it like so:
nohup ./ HOSTNAME > /tmp/networktest.out 2>&1 &

Again replace HOSTNAME with the host you are trying to ping. In this approach you are passing the hostname as an argument to the shellscript.

Just as a general warning, if your host stays down, you will have this script continuously pinging in the background until you either kill it or the host is found. So I would keep that in mind when you run this. Because you could end up eating system resources if you forget about this.

Method 2

By passing the parameters ‘-c 30’ to ping, it will try 30 ping and stop. It will check after if the command succeeds. I think it is best to do a loop that contains one ping and check if this ping succeed. Something like that:

while true;
  ping -c1
  if [ $? -eq 0 ]
    exit 0

If by still running on the foreground, you mean it is still printing on the terminal, you can redirect stdin and stdout to /dev/null .

Method 3

ping -oc 100000 Hostname > /dev/null && /root/scripts/
  • ping -o exits the ping after the first packet is received
  • > /dev/null redirects the output, so you won’t see it
  • && would run the next command, if the previous command ere successful

In addition, you can run any process in the background by adding & to the end of it; for example, echo "123" & will run in the background

Method 4

An old post, but as a suggestion you can use the -w option on ping to avoid the loop. For example,

ping -w 30 -c 1 host

will try for 30 seconds with one ping per second (default ping has 1 second interval between pings) and will exit on the first successful ping.

If you don’t need a timeout, I.e. wait for ever, just use a very large value with -w.

Method 5

Here is working modification of your script.

ping -c1 > /dev/null
if [ $? -eq 0 ]
    echo ok 
    exit 0
    echo “fail”

You need to send the output to /dev/null so it won’t appear on the screen.

-c is meant for count. If you put -c30, you’re going to ping 30 times before your script can move on to the next line. I use -c1 to make the script run faster.

-i is to wait seconds between sending each packet. So -i3 is to wait 3 seconds. I remove -i to make the script run faster.

Last but not least, use indention so that your code looks nice and easier to read.

Sample output

<a href="" class="__cf_email__" data-cfemail="641117011624080d0a111c">[email protected]</a>:~$ ./ 
<a href="" class="__cf_email__" data-cfemail="91e4e2f4e3d1fdf8ffe4e9">[email protected]</a>:~$

<a href="" class="__cf_email__" data-cfemail="7d080e180f3d1114130805">[email protected]</a>:~$ ./ 
<a href="" class="__cf_email__" data-cfemail="7e0b0d1b0c3e1217100b06">[email protected]</a>:~$

Method 6


if [ $1 ]
for i in ` cat $1`
VAR1=$(ping -ac 2 $i| grep -c error)
if [ $VAR1 == "0" ]
echo " valid : $i"


echo " invalid : $i"


echo " please present the file name. example: pong /tmp/a "


All methods was sourced from or, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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