From bodec@sherwood.co.uk Tue Dec  3 22:11:27 1996
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From: Casper Boden-Cummins <bodec@sherwood.co.uk>
Newsgroups: comp.editors,comp.unix.shell
Subject: Re: [Q] Script, SED/vi Question....
Date: Mon, 02 Dec 1996 14:42:27 -0800
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Eli The Bearded wrote:
> 
> (Crossposting and follow-ups modified. This is more of a comp.editors
> question. Posted and cc'ed to Don.)
> 
> Icarus Sparry <ccsis@bath.ac.uk> wrote:
> >DonQ <don@trotsky.mv.com> wrote:
> >>I'm a newbie who wants to write a shell script to take a file as a
> >>parameter and insert three additional text lines in this file,
> >>starting at row #2.
> >>Can this be acomplished with SED or "vi +c [commands]"?  Any other ways of
> >>doing this?

This is very easy for sed. For example, create a sed script tmp.sed:

  #! /bin/sed -f
  2i\
  1st inserted line\
  2nd inserted line\
  3rd inserted line

`2i' is the important instruction. All text lines following it, up to
and including the first line not ending with a blackslash, are inserted
*at*, not after, line 2.

Don't forget to make it executable:

  chmod +x tmp.sed

Now, create the input file tmp.input:

  line 1
  line 2
  line 3

And say:

  tmp.sed tmp.input

and we get...

  line 1
  1st inserted line
  2nd inserted line
  3rd inserted line
  line 2
  line 3

sed is a useful tool for messing around with text files. For examples
and tutorials, see my sed Web site at http://www.wollery.demon.co.uk/.
There are also links to other Web sites, sed binaries, and more.

Casper Boden-Cummins.