bjoernvold.com

Often when I work with config files I like to have line numbers. This is useful for adding information in the right place and debugging scripts.
In arch; /etc/rc.config is a clear candidate.
So I do a:

Just replace the path and file with anything you like.
It will look like this

It's nice
But we can go on debugging our file: After having identified the lines that we have made a lot of changes to we can list only those line numbers:

Here I will only get a listing of line 10 and 20 of the file /etc/rc.conf. Making the work a lot easier.


Now this is utterly useless you say? Because you most likely will have to view more than 2 lines - even if it is brilliant that I can extract lines from different places in the file.
Fear not; you can replace 10 p in the example above with
10,20 p - to list all files between line 10 and 20
or
10,$ p - To list everything from line 10 to the end of file.

In this case we do not need the -e switch for line 20 anymore so we can remove it (we don't have to, but you would get line 20 twice) like this:

Will show everything from line 10 to EOF


Will show lines 10 to 20.
And so on.
And now to the Einstein competition based on this: How can I print out line 10,20 and 30 from my file?

seems to be a form that works, here. -P option to lpr specifies the printer to use, which can be got with:

That is almost cheating - Gurus always know the answer
adding the -e switches is correct of course. And that printer stuff is probably perfect too. I did say print but I was only thinking of showing it in the terminal.
So I would have settled for
Mea culpa and new knowledge - perfect result