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How to Use awk to Group by and Sum Column Values Often you may want to use awk to sum the values in one column of a file, grouped by the values of another column in a file You can use the following syntax to do so: NR == 1 { print; next } { a[$1] += $2 } END { for (i in a) { printf "%-15s\t%s\n", i, a[i] | "sort -rnk2";
awk - Group by and sum column values - Unix Linux Stack Exchange cuonglm answer solves your typo, to get the values in ascending order (as asked in your comment), pipe the output through sort -n -k 2 (sort as numbers (-n, on second field (-k 2), after changing the print statement to output the floats as in your example: NR == 1 { print; next } { a[$1] += $2 } END { for (i in a) { printf "%-15s\t% 1f\n", i, a[i];
Sum Operation with AWK | Aggregate Functions in Unix By default, the awk sum command sums up values in the first column ($1) But what if you want to sum up values in the second column, third column, or beyond? It’s simple – just change the $1 to the number of the desired column Here’s an example where we sum up values in the second column:
Grouping things with AWK - The Linux Rain For example, I can build an AWK array where the index item comes from the country field in the runs table (second field, $2) All I have to do is give AWK a name for the array and tell it where to find the index If I name the array 'a', AWK will build a 'countries' array when I declare 'a [$2]'
AWK command in Unix Linux with examples - GeeksforGeeks From loops, NR, FS, and $1 to printing a particular row, column, or even automating tiny things — AWK saves time, prevents manual errors, and increases productivity on Linux platforms
using nawk, how to sum all numbers in $1, $2, and $3 fields? using awk: awk '{x+=$0;}END{print x}' RS="[ \n]" file This will work irrespective of the number of rows or columns By using the record separator (RS) as space or a newline, every value is split into a separate line, and hence can be easily added
Using awk to sum the values of a column, based on the values of another . . . awk -F '|' '$1 == "smiths" {sum += $3} END {print sum}' inputfilename Which checks string equality This is equivalent to using the regex ^smiths$ , as mentioned in another answer, which includes the ^ anchor to only match the start of the string (the start of field 1) and the $ anchor to only match the end of the string