On 1/18/06, Todd Walton <[EMAIL PROTECTED]> wrote:
> So. Back to sed. I was hoping for a conceptual overview of the
> different parts of a sed command line. The man page says:
>
> "sed [OPTION]... {script-only-if-no-other-script} [input-file]..."
>
> So, we have the command, 'sed'. Then options to sed. Then... what?
> And the file we're performing the operation on. Presumably the file
> is optional, and stdin is okay. It occurred to me a while ago that my
> "Linux in a Nutshell" book has a whole section on sed (and awk) but I
> can't seem to find it.
>
> I'm guessing that script-only-blah part is where I put the edits to
> perform. These edits come in the form of options? (dash-something) I
> know for sure that sed does the s/// substitute, but most edits don't
> look like that, right? I think maybe s/// is all I need for my
> purposes, though. Do I just stick it in here?
OK. Here is the simple one-liner example of using sed to make a substitution:
- - - - - -
[EMAIL PROTECTED] cat text
one
two
three
four
two again
[EMAIL PROTECTED] sed 's/two/TWO/' text
one
TWO
three
four
TWO again
- - - - - -
As usual, there are lots of other things you can do. If you are
serious about using classical always-available Unix tools you should
try to get a copy of _Tke Unix Programming Environment_, Kernighan &
Pike, ISBN 0-13-937681-X. It is 21 years old by now, but chock full
of useful information. The sub-chapter on sed is only about 5 pages
long but it tells you pretty much all a normal person needs to know.
You won't learn how to write a net-news reader or a program that plays
Towers of Hanoi, however. I just checked AddAll book search, new
paperback copies can be bought for prices that range from $5 to $50.
Used hardback copies can be bought for $15 and up.
Buy the book!!
carl
--
carl lowenstein marine physical lab u.c. san diego
[EMAIL PROTECTED]
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