Dan Track wrote:
Hi
I appreciate this is off-topic but I would be grateful for some help
on this. Basically,I want to add a few lines after matching a couple
of lines in a file using sed, can someone please tell me how to do
this.
Lines to match
server 10.33.45.3
server ldap.example.com
server orion
I want to comment these lines so they become:
# server 10.33.45.3
# server ldap.example.com
# server orion
Then append these lines after the commented lines
server fire.example.com
server earth.example.com
server space.example.com
So I should end up with:
# server 10.33.45.3
# server ldap.example.com
# server orion
server fire.example.com
server earth.example.com
server space.example.com
Please bear in mind there is a lot of other text in this file not just
the above and all the other text should remain untouched.
I don't think you can match only when you hit three lines in succession
because sed is supposed to operate on one line at a time, which is what
I think you are asking for. If all you want to do is comment out each of
those lines and add some new ones, you could try the quick and dirty way:
$ cat testfile
server 10.33.45.3
server ldap.example.com
server orion
$ cat testfile | sed -e 's/^server 10.33.45.3$/# server 10.33.45.3/g' -e
's/^server ldap.example.com$/# server ldap.example.com/g' -e 's/^server
orion$/# server orion\n\nserver fire.example.com\nserver
earth.example.com\nserver space.example.com/g'
# server 10.33.45.3
# server ldap.example.com
# server orion
server fire.example.com
server earth.example.com
server space.example.com
But if your lines are out of order, then you might end up with something
like this:
$ cat testfile2
server 10.33.45.3
server orion
server ldap.example.com
$ cat testfile2 | sed -e 's/^server 10.33.45.3$/# server 10.33.45.3/g'
-e 's/^server ldap.example.com$/# server ldap.example.com/g' -e
's/^server orion$/# server orion\n\nserver fire.example.com\nserver
earth.example.com\nserver space.example.com/g'
# server 10.33.45.3
# server orion
server fire.example.com
server earth.example.com
server space.example.com
# server ldap.example.com
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