Append Output of Hostname Command to /etc/hosts

Question

I have a server in Amazon Elastic Beanstalk in which the hostname command outputs a hostname that is not a full domain and does not exist in the /etc/host file.

I'm working with some software that for some reason relies on the system hostname to work.

I wanted to append the output of the hostname command to the /etc/hosts file referring to the local machine.

Right now I have a host file that looks like this:

127.0.0.1 localhost localhost.localdomain

I am running a command like this to append to the file.

hostname | tr '\n' ' ' >> /etc/hosts

The issue is that the hostname appends as a newline. Like this:

127.0.0.1 localhost localhost.localdomain
ip-10-0-1-162

I want it to append to the same line.

Joao Morais · Accepted Answer · 2016-02-16 22:26:59Z

2

You can use sed to edit the first line of the file:

sed -i "1s/$/ $(hostname | tr '\n' ' ')/" /etc/hosts

answered Feb 16, 2016 at 22:26

Joao Morais

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jsfan · Accepted Answer · 2016-02-16 22:28:51Z

0

You could use something like

echo "`cat /etc/hosts` `hostname`"

You might be able to write that straight back to /etc/hosts but I'd rather write it to a temporary file and then replace /etc/hosts with that.

If you want no new line at the end of the file, use

echo -n

instead.

This assumes that you want to append to the last line in the file.

answered Feb 16, 2016 at 22:28

jsfan

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1 Comment

lordmj Over a year ago

If I wanted a single line command to accomplish this method how would I do it?

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