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Help with bash script to get continual input
I need a script to take input in the form of a server name, perform the nslookup command, output only the actual IP server address (not the DNS server) and print the output. I have part of the script but need help on the rest. Thanks.
______
#!/usr/bin/bash
echo “Enter a ServerName.\n”
read serverName
nsLook = $(echo nslookup $serverName | egrep -o “Non*" | # this is the part where I need help with getting the last IP address
print nsLook
echo “Do you have another?\n”
case:
yes)
next;; # this is the part where I need help
no)
break;;
esac
______
#!/usr/bin/bash
echo “Enter a ServerName.\n”
read serverName
nsLook = $(echo nslookup $serverName | egrep -o “Non*" | # this is the part where I need help with getting the last IP address
print nsLook
echo “Do you have another?\n”
case:
yes)
next;; # this is the part where I need help
no)
break;;
esac
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#!/bin/bash
function get_nameservers() {
read -p "Enter a Server Name: " serverName
nsLook=`nslookup $serverName`
server_addy=`echo $nsLook | cut -d " " -f2`
echo $server_addy
get_nameservers
}
get_nameservers
function get_nameservers() {
read -p "Enter a Server Name: " serverName
nsLook=`nslookup $serverName`
server_addy=`echo $nsLook | cut -d " " -f2`
echo $server_addy
get_nameservers
}
get_nameservers
Though unless you're configured to use multiple DNS servers, the answer back should always be the same.
I misread your question and have changed one of the lines:
#!/bin/bash
function get_nameservers() {
read -p "Enter a Server Name: " serverName
nsLook=`nslookup $serverName`
server_addy=`echo $nsLook | cut -d ":" -f6`
echo $server_addy
get_nameservers
}
get_nameservers
#!/bin/bash
function get_nameservers() {
read -p "Enter a Server Name: " serverName
nsLook=`nslookup $serverName`
server_addy=`echo $nsLook | cut -d ":" -f6`
echo $server_addy
get_nameservers
}
get_nameservers
Hello Jan,
Thanks for the quick response. This extracted only the nameserver at first. Then after trying it again (and double-checking the terminal session to confirm), it began to work. That buggy issue may have to do with the version of Terminal (OS X El Capitan) I am using but it's currently working.
I have another question regarding an event where there is no server found. Instead of a lengthy error in the form of all of the names of the files in the working directory, is there a possible if/then statement to use in that code block to return "N/A" if the variable $server_addy has no value?
Thanks for the quick response. This extracted only the nameserver at first. Then after trying it again (and double-checking the terminal session to confirm), it began to work. That buggy issue may have to do with the version of Terminal (OS X El Capitan) I am using but it's currently working.
I have another question regarding an event where there is no server found. Instead of a lengthy error in the form of all of the names of the files in the working directory, is there a possible if/then statement to use in that code block to return "N/A" if the variable $server_addy has no value?
This?
#!/bin/bash
function get_nameservers() {
read -p "Enter a Server Name: " serverName
nsLook=`nslookup $serverName`
server_addy=`echo $nsLook | cut -d ":" -f6`
if [ -z "$server_addy" ]; then
echo "Server IP not found, possible invalid domain name"
else
echo $server_addy
fi
get_nameservers
}
get_nameservers
#!/bin/bash
function get_nameservers() {
read -p "Enter a Server Name: " serverName
nsLook=`nslookup $serverName`
server_addy=`echo $nsLook | cut -d ":" -f6`
if [ -z "$server_addy" ]; then
echo "Server IP not found, possible invalid domain name"
else
echo $server_addy
fi
get_nameservers
}
get_nameservers
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