input data automatically into read variable on bash script

Question

How can i detect the servers domain name and automatically have it inputted so i can just press enter

    echo "
Please enter your domain name : "
read Domain
echo $Domain > /root/domain.info
Hostname=server.$Domain

Thanks, Chris

assuming this is a linux server, and not Microsoft Windows, depending on your linux distribution see if you have the environment variable $dnsdomainname or $domainname. If so problem solved. Also look at unix.stackexchange.com/questions/38209/… — ron
– ron, Commented Dec 19, 2016 at 0:26
can also do a if [ -z "$domainname" ] for example to check if there is a domain name set, if not then prompt user to enter something. stackoverflow.com/questions/11686208/… — ron
– ron, Commented Dec 19, 2016 at 0:30

George Vasiliou · Accepted Answer · 2016-12-19 01:04:20Z

1

Hostname=$(uname -n) #or $(hostname -f)
Nameserver=$(cat /etc/resolv.conf)

To check if it is set:

if [ -z "$Hostname" ];then  
read -p "Give name " name
Hostname=$name
fi

Also notice that Linux / UNIX comes with the following utilities to display hostname / domain name:

a) hostname – show or set hostname
b) domainname – show or set NIS/YP domain name
c) dnsdomainname – show DNS domain name
d) nisdomainname – show or set NIS/YP domain name
e) ypdomainname – show or set NIS/YP domain name

answered Dec 19, 2016 at 1:04

George Vasiliou

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1 Comment

ivanivan Over a year ago

While this does indeed get your host name, very frequently that ISN"T the FQDN that "the world" uses to get to the box.

mklement0 · Accepted Answer · 2016-12-19 02:50:08Z

1

It sounds like you want to prefill the edit buffer when you use the read builtin.

Bash v4+ allows you to do that by combining the -e option (which activates readline library support) with -i <editBufferDefault>; e.g.:

editBufferDefault=$(domainname)  # get default value to offer to the user
read -e -p "Please enter your domain name: " -i "$editBufferDefault"

answered Dec 19, 2016 at 2:50

mklement0

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