Passing for loop using non-integers to awk - bash

Question

I am trying to write code which will achieve:
Where $7 is less than $i (0 - 1 in increments of 0.05), print the line and pass to word count. The way I tried to do this was:
for i in $(seq 0 0.05 1); do awk '{if ($7 <= $i) print $0}' file.txt | wc -l ; done
This just ends up returning the word count of the full file (~40 million lines) for each instance of $i. When, for example using $7 <= 0.00, it should be returning ~67K.
I feel like there may be a way to do this within awk, but I have not seen any suggestions which allow for non-integers.
Thanks in advance.

Answer 1

Pass $i to awk as a variable with -v and so:
for i in $(seq 0 0.05 1); do awk -v i=$i '{if ($7 <= i) print $0}' file.txt | wc -l ; done

Answer 2

Some made up data:
$ cat file.txt
1 2 3 4 5 6 7 a b c d e f
1 2 3 4 5 6 0.6 a b c
1 2 3 4 5 6 0.57 a b c d e f g h i j
1 2 3 4 5 6 1 a b c d e f g
1 2 3 4 5 6 0.21 a b
1 2 3 4 5 6 0.02 x y z
1 2 3 4 5 6 0.00 x y z l j k
One possible 100% awk solution:
awk '
BEGIN { line_count=0 }
{ printf "================= %s\n",$0
for (i=0; i<=20; i++)
{ if ($7 <= i/20)
{ printf "matching seq : %1.2f\n",i/20
line_count++
seq_count[i]++
next
}
}
}
END { printf "=================\n\n"
for (i=0; i<=20; i++)
{ if (seq_count[i] > 0)
{ printf "seq = %1.2f : %8s (count)\n",i/20,seq_count[i] }
}
printf "\nseq = all : %8s (count)\n",line_count
}
' file.txt
# the output:
================= 1 2 3 4 5 6 7 a b c d e f
================= 1 2 3 4 5 6 0.6 a b c
matching seq : 0.60
================= 1 2 3 4 5 6 0.57 a b c d e f g h i j
matching seq : 0.60
================= 1 2 3 4 5 6 1 a b c d e f g
matching seq : 1.00
================= 1 2 3 4 5 6 0.21 a b
matching seq : 0.25
================= 1 2 3 4 5 6 0.02 x y z
matching seq : 0.05
================= 1 2 3 4 5 6 0.00 x y z l j k
matching seq : 0.00
=================
seq = 0.00 : 1 (count)
seq = 0.05 : 1 (count)
seq = 0.25 : 1 (count)
seq = 0.60 : 2 (count)
seq = 1.00 : 1 (count)
seq = all : 6 (count)
BEGIN { line_count=0 } : initialize a total line counter
print statement is merely for debug purposes; will print out every line from file.txt as it's processed
for (i=0; i<=20; i++) : depending on implementation, some versions of awk may have rounding/accuracy problems with non-integer numbers in sequences (eg, increment by 0.05), so we'll use whole integers for our sequence, and divide by 20 (for this particular case) to provide us with our 0.05 increments during follow-on testing
$7 <= i/20 : if field #7 is less than or equal to (i/20) ...
printf "matching seq ... : print the sequence value we just matched on (i/20)
line_count++ : add '1' to our total line counter
seq_count[i]++ : add '1' to our sequence counter array
next : break out of our sequence loop (since we found our matching sequence value (i/20), and process the next line in the file
END ... : print out our line counts
for (x=1; ...) / if / printf : loop through our array of sequences, printing the line count for each sequence (i/20)
printf "\nseq = all... : print out our total line count
NOTE: Some of the awk code can be further reduced but I'll leave this as is since it's a little easier to understand if you're new to awk.
One (obvious?) benefit of a 100% awk solution is that our sequence/looping construct is internal to awk thus allowing us to limit ourselves to one loop through the input file (file.txt); when the sequence/looping construct is outside of awk we find ourselves having to process the input file once for each pass through the sequence/loop (eg, for this exercise we would have to process the input file 21 times !!!).

Answer 3

Using a bit of guesswork as to what you actually want to accomplish, I came up with this:
awk '{ for (i=20; 20*$7<=i && i>0; i--) bucket[i]++ }
END { for (i=1; i<=20; i++) print bucket[i] " lines where $7 <= " i/20 }'
With the mock data from mark's second answer I get this output:
2 lines where $7 <= 0.05
2 lines where $7 <= 0.1
2 lines where $7 <= 0.15
2 lines where $7 <= 0.2
3 lines where $7 <= 0.25
3 lines where $7 <= 0.3
3 lines where $7 <= 0.35
3 lines where $7 <= 0.4
3 lines where $7 <= 0.45
3 lines where $7 <= 0.5
3 lines where $7 <= 0.55
5 lines where $7 <= 0.6
5 lines where $7 <= 0.65
5 lines where $7 <= 0.7
5 lines where $7 <= 0.75
5 lines where $7 <= 0.8
5 lines where $7 <= 0.85
5 lines where $7 <= 0.9
5 lines where $7 <= 0.95
6 lines where $7 <= 1