shell script to add DNS or host entry in /etc/hosts
The below scrip will search for the given IP and the DNS or host in /etc/hosts file
# Declare the ip which you want to add
ip="127.0.0.1"
# Execute grep command to find IP and store it
found=$(grep -lr "$ip" /etc/hosts)
# Evaluate the IP or DNS is found or not
if [[ $found != "/etc/hosts" ]]; then
echo "127.0.0.1 localhost.localdomain localhost" >> testecho
echo 'DNS or host is added in /etc/hosts'
else
echo 'ip exists!!'
fi
In this script the grep command searches for given ip and lists the file /etc/hosts
The result is stored in the variable found. If the value stored in the variable found is equal to /etc/hosts then the DNS or host value will not be added or appended into the /etc/hosts. Else the DNS or host will be added into the file /etc/hosts
OUTPUT:
[shell-script]# sh add-dns.sh
DNS or host is added in /etc/hosts
[shell-script]# cat /etc/hosts
::1 localhost6.localdomain6 localhost6
127.0.0.1 localhost.localdomain localhost
Here when the script is executed the host or DNS value is added / appended to the file /etc/hosts
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