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ssh to another computer

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# 1  
Old 11-14-2008
ssh to another computer
I was wondering if there is a way to make an if statement to check if a computer is online.
something like
if comp1 is on
ssh -X [comp1]
else
ssh -X [comp2]
# 2  
Old 11-14-2008
try a ping <hostname> ..ping once ..awk the result and
save it into varibale and check that in IF condition.
# 3  
Old 11-14-2008
one way:
Code:
ping remotenode -n 1 -m 3

if [[ $? -eq 0 ]] ; then
         echo "remote node up"
else
         echo "remote now down"
fi

# 4  
Old 11-14-2008
Quote:
Originally Posted by jim mcnamara
one way:
Code:
ping remotenode -n 1 -m 3
 
if [[ $? -eq 0 ]] ; then
         echo "remote node up"
else
         echo "remote now down"
fi

What is -m ?

My CentOS 5.2 doesnot support -m

This worked for me:
Code:
# -c 1 = Send only 1 ping
# -W 2 = 2 second timeout

ping $1 -c 1 -W 2 > /dev/null

if [[ $? -eq 0 ]] ; then
         echo "remote node up"
else
         echo "remote now down"
fi

Last edited by Ikon; 11-14-2008 at 05:39 PM..
# 5  
Old 11-14-2008
ping doesn't play fair: -W and -m are for timeout and seem to depend on which family your unix derives from. -W is BSD. ping is not standardized, at least my POSIX guide doesn't show it being so.
# 6  
Old 11-14-2008
Thank you for all the help! it worked out just great!
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