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Change $HOST in /etc/hosts

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# 1  
Old 04-04-2009
Change $HOST in /etc/hosts
I want to change the following lines in /etc/hosts on FreeBSD:
Code:
::1         localhost localhost.my.domain
127.0.0.1       localhost localhost.my.domain

into the following lines
Code:
::1         localhost foo.example.com
127.0.0.1       localhost foo.example.com

I have the following script to do that:
Code:
# set subdomain in hosts file
sed -i '' -e 's/localhost.my.domain/$HOST/' /etc/hosts

in an attempt to use the prepopulated environment variable $HOST for that. But the result is as follows:
Code:
::1         localhost $HOST
127.0.0.1       localhost $HOST

What can I do to correct this? Thanks in advance
# 2  
Old 04-04-2009
Use double quotes instead of single quotes in a sed command if you use shell variables.

Regards
# 3  
Old 04-04-2009
try this::

Quote:
sed 's/localhost.my.domain/' $HOST '/' /etc/hosts
# 4  
Old 04-05-2009
@dennis.jacob: tried your suggestion, but to no avail
@Franklin52: thanks, that worked
# 5  
Old 04-05-2009
Quote:
Originally Posted by figaro
@dennis.jacob: tried your suggestion, but to no avail
@Franklin52: thanks, that worked
It works well for me. Can you paste the error which you are getting.

Quote:
/home/aj >echo $HOST
foo.example.com
/home/aj >cat abc
::1 localhost localhost.my.domain
127.0.0.1 localhost localhost.my.domain
/home/aj >sed 's/localhost.my.domain/'$HOST'/' abc
::1 localhost foo.example.com
127.0.0.1 localhost foo.example.com
# 6  
Old 04-05-2009
dennis.jacob: Thank you for your response. Your code is working indeed after removing superfluous spaces. Previous error message was as follows:
Code:
# sed -i '' 's/localhost.my.domain/' $HOST '/' /etc/hosts
sed: 1: "s/localhost.my.domain/": unterminated substitute in regular expression

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