I Sed, she sed

Goose · 20-06-2008, 17:03

Does anyone here use sed much? I've got a bit stuck, could do with some help!

Garp · 20-06-2008, 17:03

Quote:

Originally Posted by Goose

Does anyone here use sed much? I've got a bit stuck, could do with some help!

Whatcha trying to achieve? I use it on and off here.

Goose · 20-06-2008, 17:07

Right, this is a simple example. In real times, my data is a bit hairy but the idea should work.

I have a file populated a little like this:

abcdefghijklmn<<o>>pqrstuvwxyz
abcdefghijklmnopqrstuvwxyz
abcdefg<h>ijklmnopqrstuvwxyz
abcdefghijkl<<m>>nopqr<<s>>tuvwxyz
abcdef<g>hijklmnopqrs<<t>>uvwxyz
abcdefghijklmno<<p>>qrstuvwxyz

I need to use sed to extract out anything surrounded by << >>. So ideally I'd end up with:

o
m
s
t
p

It's frustrating me somewhat.

Mark · 20-06-2008, 20:30

The fact you can have more than one pattern per line caused me some major grief, but if it's OK to use sed twice, then I managed to get around that one:

Code:

sed '/\(<<[^<>]*>>\)/s//\n\1\n/g' | sed '/^<<\([^<>]*\)>>$/s//\1/p;d'

The first sed breaks out the <<...>> so that each is split out onto a line by itself, then the second one picks out just those lines.

Goose · 20-06-2008, 20:40

Thanks Mark. I've not used sed much, takes some getting used to.

Goose · 07-10-2008, 10:09

Quote:

Originally Posted by Mark

The fact you can have more than one pattern per line caused me some major grief, but if it's OK to use sed twice, then I managed to get around that one:

Code:

sed '/\(<<[^<>]*>>\)/s//\n\1\n/g' | sed '/^<<\([^<>]*\)>>$/s//\1/p;d'

The first sed breaks out the <<...>> so that each is split out onto a line by itself, then the second one picks out just those lines.

Just realised this screws up when it comes across something like:

Code:

abcdefgh<<ijklmno>pqrst>>uvwxyz
abcdefgh<<ijklmno<pqrst>>uvwxyz

Mark · 20-06-2008, 20:43

Make sure you use the latest edit - I spotted a few bits of redundant code in the original and removed them.

Fayshun · 20-06-2008, 23:26

Quote:

sed '/$<<[^<>]*>>$/s//\n\1\n/g' | sed '/^<<$[^<>]*$>>$/s//\1/p;d'

Such language on a family forum!

Mark · 21-06-2008, 03:13

I do wonder what that would say when translated into semaphore and back.

Goose · 23-06-2008, 15:34

OK, second challange. This should be easy, I've nearly got it working but seem to be running in circles.

Say you have this:

Code:

{.One$="One",.Number=12,.Two$="Two",.Number=13,.Three$="Three",/

I need to grab everything between .Two$=" and the following "

A pint to whoever digs me out of sed hell #2.

I really should buy a book on this...

20-06-2008, 17:03	#1
Goose The list is long, but distinguished Join Date: Dec 2006 Location: Århus, Denmark Posts: 1,643	I Sed, she sed Does anyone here use sed much? I've got a bit stuck, could do with some help! __________________

20-06-2008, 17:07	#3
Goose The list is long, but distinguished Join Date: Dec 2006 Location: Århus, Denmark Posts: 1,643	Right, this is a simple example. In real times, my data is a bit hairy but the idea should work. I have a file populated a little like this: abcdefghijklmn<<o>>pqrstuvwxyz abcdefghijklmnopqrstuvwxyz abcdefg<h>ijklmnopqrstuvwxyz abcdefghijkl<<m>>nopqr<<s>>tuvwxyz abcdef<g>hijklmnopqrs<<t>>uvwxyz abcdefghijklmno<<p>>qrstuvwxyz I need to use sed to extract out anything surrounded by << >>. So ideally I'd end up with: o m s t p It's frustrating me somewhat. __________________

20-06-2008, 20:30	#4
Mark Screaming Orgasm Join Date: Jul 2006 Location: Newbury Posts: 15,194	The fact you can have more than one pattern per line caused me some major grief, but if it's OK to use sed twice, then I managed to get around that one: Code: sed '/\(<<[^<>]>>\)/s//\n\1\n/g' \| sed '/^<<\([^<>]\)>>$/s//\1/p;d' The first sed breaks out the <<...>> so that each is split out onto a line by itself, then the second one picks out just those lines. Last edited by Mark; 20-06-2008 at 20:35.

20-06-2008, 20:40	#5
Goose The list is long, but distinguished Join Date: Dec 2006 Location: Århus, Denmark Posts: 1,643	Thanks Mark. I've not used sed much, takes some getting used to. __________________

21-06-2008, 03:13	#9
Mark Screaming Orgasm Join Date: Jul 2006 Location: Newbury Posts: 15,194	I do wonder what that would say when translated into semaphore and back. Last edited by Mark; 21-06-2008 at 03:45.

20-06-2008, 20:43	#7
Mark Screaming Orgasm Join Date: Jul 2006 Location: Newbury Posts: 15,194	Make sure you use the latest edit - I spotted a few bits of redundant code in the original and removed them.

23-06-2008, 15:34	#10
Goose The list is long, but distinguished Join Date: Dec 2006 Location: Århus, Denmark Posts: 1,643	OK, second challange. This should be easy, I've nearly got it working but seem to be running in circles. Say you have this: Code: {.One$="One",.Number=12,.Two$="Two",.Number=13,.Three$="Three",/ I need to grab everything between .Two$=" and the following " A pint to whoever digs me out of sed hell #2. I really should buy a book on this... __________________