[Tutor] Finding Hostname-IP DNS mappings and if machine is dead or alive

[Emile van Sebille]

How far have you gotten?  Post your code to show us where you're at and 
we can point you in the right direction.

Emile


On 5/12/2014 2:44 PM, KIRAN D.S. wrote:
> Hi,
>
> I have a UNIX shell script that:
> a.  lists out the Hostname-IP DNS mappings
> b.  checks whether the machine is pingable, and prints "dead" or "alive"
> depending on status.
>
> I want to write this program in Python but am struggling.  Can someone
> help please ?
>
> Here's my script and output run
> ===============================
> (I have changed my company name to "company", and machine names for
> privacy reasons)
>
> pqr49: / >
> pqr49: / > cat 72-network-IP-DNS-checker
> #!/bin/bash
> i=1
> while [ $i -lt 255 ]; do
>    hostip=10.145.72.$i
>    echo -n "$hostip "
>    hn=None
>    host $hostip > /dev/null 2>&1
>    if [ "$?" -ne 0 ]; then
>      echo -n NoDNS
>     else
>      echo -n DNS
>      hn=`host $hostip | awk '{print $NF}'`
>    fi
>    ping $hostip 1 > /dev/null 2>&1
>    if [ "$?" -eq 0 ]; then
>      echo -n " alive "
>     else
>      echo -n " dead "
>    fi
>    echo $hn
>    i=`expr $i + 1`
> done
> exit
> pqr49: / >
> pqr49: / > ./72-network-IP-DNS-checker
> 10.145.72.1 DNS alive piedmont22-1257-rtr-1-v3007.us.company.com.
> 10.145.72.2 NoDNS dead None
> 10.145.72.3 NoDNS dead None
> 10.145.72.4 NoDNS dead None
> 10.145.72.5 NoDNS alive None
> 10.145.72.6 DNS dead golf9999-nwk1k.us.company.com.
> 10.145.72.7 DNS alive golf9999-nwk2a.us.company.com.
> 10.145.72.8 DNS alive golf9999-nwk2c.us.company.com.
> 10.145.72.9 NoDNS dead None
> 10.145.72.10 DNS alive pqr585.us.company.com.
> 10.145.72.11 DNS alive pqr585-sp.us.company.com.
> 10.145.72.12 DNS alive pqr585-2540-1.us.company.com.
> 10.145.72.13 DNS alive pqr585-2540-2.us.company.com.
> 10.145.72.14 DNS alive xyz-efgh101.us.company.com.
> 10.145.72.15 DNS alive xyz-efgh101-pqrst.us.company.com.
> 10.145.72.16 DNS alive xyz-efgh102.us.company.com.
> 10.145.72.17 DNS alive xyz-efgh102-pqrst.us.company.com.
> 10.145.72.18 DNS alive xyz-def-ib102.us.company.com.
> 10.145.72.19 DNS dead pqr294-sp.us.company.com.
> 10.145.72.20 DNS alive pqr582.us.company.com.
> 10.145.72.21 DNS alive pqr582-sp.us.company.com.
> 10.145.72.22 DNS alive pqr580.us.company.com.
> 10.145.72.23 DNS alive pqr580-sp.us.company.com.
> 10.145.72.24 DNS alive pqr550.us.company.com.
> 10.145.72.25 DNS dead pqr551.us.company.com.
> 10.145.72.26 DNS alive pqr551-sp.us.company.com.
> 10.145.72.27 DNS^C
> pqr49: / >
> pqr49: / >
>
>
> Thank you and regards,
> Kiran
>
>
>
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