Hi all,

I want to insert "headlines" at 10th, and 15th line number of test_file using sed in one command. I tried following.


it inserted on 10 but also on 12,14,16,18,20 ....don't know why
Is it possible to inert a string on a number of lines using sed ?

sed '10,15 <command>'
means do the command over the range 10-15. In you case, the command is "i" for insert. Thus you wind up with the inserted text on every other line. (Specifically, "i" inserts a new line in place of the one specified--and then moves everything down.)

In my docs, I don't see how to do what you want without simply having two commands, eg:

sed -e '10 i <text>' -e '15 i <text>' filename

The addresses and <text> can both be variables. (Use double-quotes if you have a "$" in the sed expression---or escape it.)

Good SED tutorial here:
http://www.grymoire.com/Unix/Sed.html

Seder's grab bag: http://sed.sourceforge.net/grabbag/tutorials/

thanks for the info.....I was being somewhat lazy to read all these documentation ......got the point now...I will go through these tutorials again and bug you people again if I got a doubt.

thanks again......

To avoid typing in the text repeatedly you can do this:

Basically, I've set up a mark at the end of the code (:a) with an instruction after it (insert boogie). I prevent the instruction from being executed by putting a b command before it (jump to the end of the script). The only way I can get to the code is by explicitly jumping to the mark, which I do on lines 3, 5 and 7.

Regards, Feder

Thanks a lot Feder...It is working however, I had to modify it to insert on the desired lines...also the explaination is very helpful to understand the conecpt ....Thanks again...