choose random text between constant string.. using awk?

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02-14-2010

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choose random text between constant string.. using awk?

Hallo
I have maybe a little bit advanced request....
I need to choose one random part betwen %....

so i have this..

Code:

%
text1 text1 text1
text1 text1 text1
text1 text1 text1
%
text2 text2
text2 text2 text2
%
text3 text3 text3
tetx3
%

this choose text between %

Code:

awk ' /%/ {flag=1;next} /%/{flag=0} flag { print }' file

so i get

Code:

text1 text1 text1
text1 text1 text1
text1 text1 text1
text2 text2
text2 text2 text2
text3 text3 text3
tetx3

I NEED JUST ONE PART

Code:

text1 text1 text1
 text1 text1 text1
 text1 text1 text1

or

Code:

text2 text2
 text2 text2 text2

or

Code:

text3 text3 text3
 tetx3

Any help would be appreciate....

Last edited by Scott; 02-14-2010 at 06:43 AM.. Reason: Please use code tags

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02-14-2010

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Your solution is equivalent to:

Code:

awk '/%/{next}{print}' infile

This should print only the first segment:

Code:

awk '/%/{p++;next}p==1{print}' infile

This the second:

Code:

awk '/%/{p++;next}p==2{print}' infile

etcetera

Last edited by Scrutinizer; 02-14-2010 at 07:00 AM..

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Thank you very much Scrutinizer.... this helped me a lot...

Code:

awk '/%/{p++;next}p==1{print}' infile

Last edited by Scott; 02-14-2010 at 07:10 AM.. Reason: Code tags

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try the next code uses rand function

Code:

awk 'BEGIN{ RS="%"  ;srand() } { line[NR] = $0 } END{ print line[randint(NR)] } function randint(n) {return int(n * rand()) + 1}' infile

Or

Code:

awk 'BEGIN{ RS="%\n"  ;srand() } { line[NR] = $0 } END{ print line[int((NR* rand()) + 1)]}'  infile

Last edited by ironmask2004; 02-14-2010 at 07:43 AM..

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Very nice ironmask2004 it is great too ....

I have just finished it with the previous solution

Code:

vtip=$RANDOM
let "vtip=1+(vtip%2125)"
awk -v cislo=$vtip '/%/{p++;next}p==cislo' vtipy.txt

Last edited by Scott; 02-14-2010 at 07:48 AM.. Reason: Code tags, please...

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Quote:

Originally Posted by sandwich

Very nice ironmask2004 it is great too ....

I have just finished it with the previous solution
vtip=$RANDOM
let "vtip=1+(vtip%2125)"
awk -v cislo=$vtip '/%/{p++;next}p==cislo' vtipy.txt

but you need to know how muche recoreds you have insaide the fill to generate a random number betwwen 1 and NUM Of Rec !!!

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yes good question i have used

Code:

grep -c "^[%]" vtipy.txt

and the number was 2126

Code:

vtip=$RANDOM
let "vtip=1+(vtip%2125)"   #thats why here is 2125 it is modulo
awk -v cislo=$vtip '/%/{p++;next}p==cislo' vtipy.txt

Last edited by Scott; 02-14-2010 at 08:02 AM.. Reason: Code tags, PLEASE!

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