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Every nth line with different starting point

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Top Forums Shell Programming and Scripting Every nth line with different starting point
# 15  
Old 10-04-2009
Surprisingly, when i tried your first code on SUN, i.e.
awk '{print > "file" (NR-1)%3+1}' infile
it worked pretty well!!
I'm always surprised when my code works pretty well!!

You don't have 2000 files, you have 3 files. Do you mean you want 3 * 10 files?

If so, then a for-loop, as you suggest would do fine.

(untested because my VM just went on the blink, something like...)
{ for( I = 1; I <= NF; I++ )
    print > "file" (NR-1)%3+1 "_" I

Last edited by Scott; 10-04-2009 at 01:55 PM.. Reason: typo
# 16  
Old 10-04-2009
well, (NR-1)%3+1 was just a test, the increments between lines were actually 3325 in my actual input file, so i replace 3 with 3325! so i am dealing with sth like 33250 files in total, sonsidering 10 fields!
# 17  
Old 10-04-2009
Yes, you're right, sorry, forgot you changed that.
# 18  
Old 10-04-2009
Hi Scottn,

I tried to change the code the get the desired outputs but it didnt happen. Assuming (NR-1%3+1), I'll bring a simple example to simplify what I am willing to have:

input file

1      7       13

2      8       14

3      9       15

4     10      16

5     11       17

6     12       18

output files

file1     file2     file3

1          2         3

4          5         6

file4       file5    file6

7            8        9

11          12      13

file7       file8     file9

13          14        15

16          17        18

So, for each fileld there will be three files containing only contents of field 1 and the same for other two fields. In general, the number of sequential numbers would be 3*3=9.

Do you have any tricks for this?
# 19  
Old 10-04-2009
bash code:
  1. awk '
  2. { for( I = 1; I <= NF; I++ ) {
  3.    print $I > "file" (NR-1)%FILES+1 + (I-1)*FILES
  4.  }
  5. }
  6. ' FILES=3 infile
# 20  
Old 10-05-2009
Your command line should look like this if you don't put the code in a file:

awk -v RF_CNT=2000 -v LN=2000 ' BEGIN {print RF_CNT;print LN;}(NR <= RF_CNT)a[NR] ="file" NR;print >a[NR];close(a[NR]);}(( i = NR %LN + 1 ) in a ){print >> a[i];close(a[i]);}' num.txt

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