Sum a column with awk and display number with printf using comma as thousands separator

Sum a column with awk and display number with printf using comma as thousands separator

Some examples of adding commas as thousands separators using awk and printf.

To add commas as thousands separator with printf:

$ echo 1000000000000 | xargs printf "%'d\n"
1,000,000,000,000

Or:

$ printf "%'d\n" 1000000000000
1,000,000,000,000

To add commas as thousands separator with awk:

$ echo 1000000000000 | awk '{ printf ("%'"'"'d\n", $1) }'
1,000,000,000,000

To sum the first column in this file:

$ cat test.txt 
1000000 foo
1000000 bar
1000000 baz

I could use this awk:

$ awk '{ sum+=$1 } END { print sum }' test.txt
3000000

To sum a column of numbers with awk and display the result with commas as thousands separator:

$ awk '{ sum+=$1 } END { printf ("%'"'"'d\n", sum) }' test.txt
3,000,000