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command to check whether the remote host is up or not

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# 1  
Old 05-24-2010
command to check whether the remote host is up or not
Hi,

My script needs to check whether the remote host is up or not.

If it is up i need to start few servers in that host or else just a notification should be sent that the remote host is down?

Could someone help me out in this?

Regards
Arun
# 2  
Old 05-24-2010
you can use following commands :

Code:
#ping <host_IP>
#ssh <host> ifconfig -a

Smilie
# 3  
Old 05-24-2010
If you use ksh, you can also use the
/dev/tcp/host/port, or
/dev/udp/host/port to check if a specific port is up in a host.
For more info:
https://www.unix.com/shell-programmin...k-url-ksh.html
# 4  
Old 05-24-2010
ksh93 does that, not ksh (which is ksh88, but it is named just ksh- /bin/ksh)
# 5  
Old 05-24-2010
Quote:
Originally Posted by arunkumarmc
Hi,

My script needs to check whether the remote host is up or not.

If it is up i need to start few servers in that host or else just a notification should be sent that the remote host is down?
Why not just go ahead and run the server starting code, without any separate host check? If the host is down, presumably the code (ssh?) will fail and you can send a notification then. You should be handling the failure anyway, since it's possible for the host to go down immediately after a successful check but prior to the execution of the server starting code.

Regards,
Alister
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