replace whole line using sed with variable

Question

file content

something
OIDCRedirectURI http://abc-mt.tc.ac.com/newredirect
something

sed command tried

URL='xyz-new.com' #This will be forming at run time

sed -i 'abc /c\ OIDCRedirectURI $URL/newredirect' /etc/httpd/conf.d/proxy.conf

Basically I want to replace the given URL with the new URL.

But is it replacing with $URL.

Any pointers?

Answer 1

Assume the new URL is saved in a shell variable: $URL This one-liner may help you:

sed -i "s@\(^OIDCRedirectURI \).*@\1$URL/newredirect@" file

In your example, the URL is not with a protocol, e.g. HTTP or https. If you want to "reuse" the protocol prefix from the "old" URL, you can add it to the capture group:

sed -i "s@\(^OIDCRedirectURI http[^/]*//\).*@\1$URL/newredirect@" file

just to show it is working:

kent$  cat /tmp/test/f
something
OIDCRedirectURI http://abc-mt.tc.ac.com/newredirect
something

kent$  URL='this.is.new.url'

kent$  sed -i "s@\(^OIDCRedirectURI http[^/]*//\).*@\1$URL/newredirect@" /tmp/test/f

kent$  cat /tmp/test/f
something
OIDCRedirectURI http://this.is.new.url/newredirect
something

Answer 2

I wouldn't use sed for this, personally.

#!/bin/sh -x

mystring="OIDCRedirectURI http://abc-mt.tc.ac.com/newredirect"
redir=$(echo -e "${mystring}" | cut -d' ' -f1)
oldurl=$(echo -e "${mystring}" | cut -d' ' -f2)
newurl="http://xyz-new.com"

echo -e "${redir} ${newurl}"

Granted, you probably want to do this in a loop with a list of such entries, but that wouldn't be too difficult. You'd just have to put your old URLs and new URLs in two stack files, and make sure that they were in the correct sequence within each.