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validating(pingable or not) remote ip address in shell script

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# 1  
Old 01-23-2012
validating(pingable or not) remote ip address in shell script
i need to verify whether the ip adress given as input to the shell script is pingable or not... that is whether the ip is alive and responding..
Code:
 
ping $ip_adress

the above wont work in script because the execution is continuous... so the shell script keeps will dwell in this pinging process... i need one shot command to check whether the remote ip is alive or not...
# 2  
Old 01-23-2012
Try this:
Code:
ping -c1 $ip_address >> /dev/null
[ $? -eq 1 ] && echo "$ip_address may not be alive

Last edited by balajesuri; 01-23-2012 at 08:35 AM..
This User Gave Thanks to balajesuri For This Post:
vivek d r
# 3  
Old 01-23-2012
thanks you code works... i used the below
Code:
ping -c1 10.19.123.104 | grep "Unreachable"

if output is nil then pingable else not... but the thing is its consuming time about 1 to 2 seconds... is there anyway we could decrease time consumed..
# 4  
Old 01-23-2012
I don't think so.
# 5  
Old 01-23-2012
oh okay... one more thing... i need to validate ip... i referred few threads in unix..

Code:
 #echo 10.19.123.250 |awk -F"." '$1 <=255 && $2 <= 255 && $3 <= 255 && $4 <= 255 ' | wc -l
1
# echo 10.19.123.256 |awk -F"." '$1 <=255 && $2 <= 255 && $3 <= 255 && $4 <= 255 ' | wc -l
0
# echo 10.19.123.250.123 |awk -F"." '$1 <=255 && $2 <= 255 && $3 <= 255 && $4 <= 255 ' | wc -l
1

the above awk code doesnt validate more characters... i tried to validate by finding no of '.' in the ip.. but grep -cF "." doesnt work too... is there anyway to count no of dots in an ip using grep..?
# 6  
Old 01-23-2012
Validate IP based on what? Your awk statements have a condition but no action.
# 7  
Old 01-23-2012
the awk is validating whether the numbers in ip doesnt exceed 255.. its doing that.. if we get 0 then invalid ip(ip having a number greater than 255) and if 1 then its a valid ip... (the 0's and 1's shown in above code is actual output)

now i found out how to count number of '.' in an ip
i used
Code:
 
 echo 10.12.12.11 | awk '{ split($0,a,"."); print length(a) - 1 }'

it worked :-)
if the number obtained is not equal to 3 then its invalid ip... thanks for helping in ip ping
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