beep when a server goes offline

while true; do [ "$(ping -c1W1w1 server-or-ip.com | awk '/received/ {print $4}')" != 1 ] && beep; sleep 1; done
pings a server once per second, and beeps when the server is unreachable. Basically the opposite of: ping -a server-or-ip.com which would beep when a server IS reachable. You could also substitute beep with any command, which makes this a powerful alternative to ping -a: while true; do [ "$(ping -c1W1w1 server-or-ip.com 2>/dev/null | awk '/received/ {print $4}')" = 1 ] && date || echo 'server is down!'; sleep 1; done which would output the date and time every sec until the ping failed, in which case it would echo. Notes: Requires beep package. May need to run as root (beep uses the system speaker) Tested on Ubuntu which doesn't have beep out of the box... sudo apt-get install beep

What Others Think

I think you can get rid of a bit of complexity (and the awk) out of this by simply using the bash OR operator, instead of the contitional test used now. Also, by using the bash block operators, { }, you can jam multiple commands after the OR expressions. while true; do ping -c1W1w1 server-or-ip.com 2>/dev/null || { echo Server down; beep; } ; sleep 1; done And another slight edit to do branching: while true; do ping -c1W1w1 google.com &>/dev/null && { echo Up;} || { echo Down; beep; } ; sleep 1; done Runs one block if the server is up, and another if it's down. Hope this helps!
clockworkavian · 498 weeks and 4 days ago
@clockworkavian: thanks for reminding me about the braces :) and the optomizations make this much easier to read, ty ty!
sudopeople · 498 weeks and 3 days ago
Great command, nice. I am a mac user so, beep isn't installed and the ping command has no -w option. I played around and made this mac version. It is just a small modification to clockworkavian's way with using the bash OR operator, cleaning up ping and using the mac speech synthesis to alert you what is going on. while true; do ping -c1 -W1 google.com &>/dev/null && { say "up";} || { say "down"; } ; sleep 1; done if the "up" goes on your nerves after sometime you could just take it out.
netsaint · 476 weeks and 2 days ago
Mac users can just use the -A option for ping which will beep when no reply is received. you can also use -a if you want an "Everything is OK" alarm.
LIV2 · 424 weeks and 2 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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