I d like to use the search pattern in the output part of a sed command. For instance, given the following sed command:
sed /HOSTNAME=/cHOSTNAME=fred /etc/sysconfig/network
I d like to replace the second instance of "HOSTNAME=" with some escape sequence that references the search term. Something like this:
# this doesn t actually work
sed /HOSTNAME=/c?=fred /etc/sysconfig/network
Does anywone know if there s a way to do this or do I have to repeat the search term in the answer.
I know I can do something like this:
sed s/(HOSTNAME=)/1fred/ /etc/sysconfig/network
But this is subtly different from what I want -- for instance #HOSTNAME=zug will turn into #HOSTNAME=fred, but I don t want the leading "#". The first sed example takes care of cases like this.