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That deletes the match. What I'm after is to negate it. Instead of replacing the match, replace EVERYTHING ELSE and leave the match alone.

I have a text file that has links in it.

I can write a match for sed to replace the link with anything.

For example:

http://www.google.com
becomes
XxX


But what I'm after is not to...

I always just redirect the output of sed to a temp file and then copy or move the temp file back over original I changed.

quote from man page for rm

Try this:

sed s/'syslogd "$src_running"'/'syslogd "$src_running" -N'/ rc.tcpip

I tried this on your example data and it changed line:

start /usr/sbin/syslogd "$src_running"

to

start...