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Picking matching strings

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# 15  
Old 04-28-2011
Quote:
Originally Posted by kristinu
When I remove the RS=" ", all the list is displayed. I thought it will display only the ones that match!!!
Then don't remove it!

Why would you to need remove it?

It takes
Code:
-a b c=d

and turns it into
Code:
-a
b
c=d

Then you can easily check (/^-/ || /=/) for what you need.

The alternative is not to use RS at all, and instead put a for-loop in your code to look at each field individually. The point, when RS saves you this trouble?
# 16  
Old 04-28-2011
My question is that if I do

Code:
echo "file1 file2 file3 -file4 file5= sdf-sdf =file filr=232 file-6" | awk '/^-/ || /=/'

I still get

Code:
file1 file2 file3 -file4 file5= sdf-sdf =file filr=232 file-6

It outputs everything.
# 17  
Old 04-28-2011
Quote:
Originally Posted by kristinu
My question is that if I do

Code:
echo "file1 file2 file3 -file4 file5= sdf-sdf =file filr=232 file-6" | awk '/^-/ || /=/'

I still get

Code:
file1 file2 file3 -file4 file5= sdf-sdf =file filr=232 file-6

It outputs everything.
I'm not sure if you're following what scottn's been explaining.
Why are still insisting on NOT using RS=' ' ?
# 18  
Old 04-28-2011
I will, but am wondering about this and try to understand why it returns everything without it. And how the RS=" " solves the problem.

---------- Post updated at 04:48 PM ---------- Previous update was at 04:46 PM ----------

I agree with you. I originally had a loop and wanted something more straightforward.

Quote:
Originally Posted by scottn
Then don't remove it!

Why would you to need remove it?

It takes
Code:
-a b c=d

and turns it into
Code:
-a
b
c=d

Then you can easily check (/^-/ || /=/) for what you need.

The alternative is not to use RS at all, and instead put a for-loop in your code to look at each field individually. The point, when RS saves you this trouble?
# 19  
Old 04-28-2011
Quote:
Originally Posted by kristinu
I originally had a loop and wanted something more straightforward.
You had it about ninety minutes ago Smilie

But you're complicating it again.

The use, and function, of RS is explained in the awk man page.
# 20  
Old 04-28-2011
Quote:
Originally Posted by kristinu
I will, but am wondering about this and try to understand why it returns everything without it. And how the RS=" " solves the problem.
I'm not sure I can explain it any better than what scottn's already tried.
Setting the RS=' ' sets a list of a space separated entries INTO a multiline record (conceptually speaking). Having a multiline record easily positions itself for using the /^-/ || /=/ pragma.

Not sure if I'm confusing you more than you deserve Smilie
# 21  
Old 04-28-2011
Ok, let's try to explain myself better. If I write it this way, I understand everything.

Code:
echo "file1 file2 file3 -file4 file5= sdf-sdf =file filr=232 file-6" | awk 'BEGIN {RS=" ";ORS=" "} /^-/ || /=/'

What I'm missing is why one sets RS=" " after the pattern matching and everything is ok.
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