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# 1  
Old 02-17-2012
ping questions
Hi All,

I used to work on Sun Solaris, On the Solaris, when I do ping, I used to get the results as

Code:
XYZ is alive

but now I work on Linux. when I do ping. I get the results. For example:

Code:
ping nyus -c 3
PING nyus (x.x.x.x) 56(84) bytes of data.
64 bytes from nyus (x.x.x.x): icmp_seq=0 ttl=64 time=0.113 ms
64 bytes from nyus (x.x.x.x): icmp_seq=1 ttl=64 time=0.095 ms
64 bytes from nyus (x.x.x.x): icmp_seq=2 ttl=64 time=0.103 ms
--- nyus ping statistics ---


But if I want the results as xyz is alive. Please advice.

Thanks.
Last edited by Scott; 02-18-2012 at 05:43 AM.. Reason: Code tags, please...
# 2  
Old 02-17-2012
Code:
ping -c 1 $hostname > /dev/null && echo "$hostname is alive"

This User Gave Thanks to Corona688 For This Post:
methyl
# 3  
Old 02-17-2012
The man page advises to use a count and a deadline to check wether a host is alive.

Something like this will be more reliable:
Code:
$ ping -c 10 -w 10 myhost >/dev/null && echo "myhost is alive"
myhost is alive

Please note that a host you can ping is alive, but you can't assume a host is down just because you can't ping it. (My apology if that was obvious to you.)
# 4  
Old 02-19-2012
Are you sure that "ping" returns a non-zero exit code when the target does not reply. Tried on HP-UX.
Code:
ping deadhost -n 2 && echo "host is alive"

PING deadhost: 64 byte packets

----deadhost PING Statistics----
2 packets transmitted, 0 packets received, 100% packet loss
host is alive

It does return a non-zero exit code if the hostname is invalid.
# 5  
Old 02-19-2012
Quote:
Originally Posted by methyl
Are you sure that "ping" returns a non-zero exit code when the target does not reply. Tried on HP-UX.
It does on Linux, I can't speak for HP-UX bugs.
# 6  
Old 02-20-2012
Quote:
I can't speak for HP-UX bugs.
Not a HP-UX bug as such. I can remember "ping" behaving like this in Berkeley unix and Unix System V. As long as you gave "ping" a valid task, you had to read the actual output of "ping".
Last edited by methyl; 02-20-2012 at 12:30 PM..
# 7  
Old 02-20-2012
As far as I recall, Solaris is the only Unix OS that returns a short "XYZ is alive" by default.
 
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