Sed: How to insert a pattern which includes single ticks?

Question

I'm trying to use sed to replace a specific line within a configuration file:

The pattern for the line I want to replace is:

ALLOWED_HOSTS.*

The text I want to insert is:

'$PublicIP' (Including the single ticks)

But when I run the command:

sed 's/ALLOWED_HOSTS.*/ALLOWED_HOSTS = ['$PublicIP']/g' /root/project/django/mysite/mysite/settings.py

The line is changed to:

ALLOWED_HOSTS = [1.1.1.1]

instead of:

ALLOWED_HOSTS = ['1.1.1.1']

How shall I edit the command to include the single ticks as well?

Possible duplicate of [How to escape single quote in sed?](http://stackoverflow.com/questions/24509214/how-to-escape-single-quote-in-sed) — Sundeep, Feb 13 '17 at 14:57

George Vasiliou · Accepted Answer · 2017-02-13T14:59:09.677

1

You could try to escape the single ticks , or better you can reassign the variable including the simple ticks:

PublicIP="'$PublicIP'".

By the way even this sed without redifining var, works ok in my case:

$ a="3.3.3.3"
$ echo "ALLOWED_HOSTS = [2.2.2.2]" |sed 's/2.2.2.2/'"'$a'"'/g'
ALLOWED_HOSTS = ['3.3.3.3']

Even this works ok:

$ echo "ALLOWED_HOSTS = [2.2.2.2]" |sed "s/2.2.2.2/'$a'/g"
ALLOWED_HOSTS = ['3.3.3.3']

edited Feb 13 '17 at 14:59

answered Feb 13 '17 at 14:53

George Vasiliou

1 Answers1