How to divide outputs of two different commands?

Question

I want to divide two values with the ubuntu terminal, but the first number is the result of doing:

wc -l file.txt

i.e: 200

And the second number is obtained by typing:

gawk '{print $3}' file.txt | sort | uniq | wc -l

i.e: 20

How can I divide these two numbers (without using the numeric values, and using a code instead?)

Answer 1

This is counting the lines of a file:

wc -l file.txt

This is counting the number of different items that occur in the 3rd column:

gawk '{print $3}' file.txt | sort | uniq | wc -l

All of it is something awk can do in an easy way:

awk '{uniq[$3]} END{print NR, length(uniq), NR/length(uniq)}' file.txt

That is:

• {uniq[$3]}
  to keep track of the items that appeared in the 3rd column

• END{print NR, length(uniq), NR/length(uniq)}
  to print the number of lines (NR) as well as the number of different items and its division. This is because NR in the END block normally holds the number of the last line that was read, and hence the number of lines, and length() is a function that returns the number of items in an array.

Test

$ cat a
1
2
3
1
2
3
$ awk '{uniq[$1]} END{print NR, length(uniq), NR/length(uniq)}' a
6 3 2
$ awk '{uniq[$1]} END{printf "lines: %d; different items: %d; proportion: %f\n", NR, length(uniq), NR/length(uniq)}' a
lines: 6; different items: 3; proportion: 2.000000

Answer 2

you can try this;

echo $(($(wc -l file.txt)  / $(gawk '{print $3}' file.txt | sort | uniq | wc -l)))

or

echo $(wc -l file.txt)/$(gawk '{print $3}' file.txt | sort | uniq | wc -l) | bc

or

expr $(wc -l file.txt) / $(gawk '{print $3}' file.txt | sort | uniq | wc -l)