linux - 如何在 linux shell 中进行求和

Question

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Answer 1

您也可以使用 awk，通过使用关联数组:

pax> echo 'orange 2000
orange 1000
orange 1500
apple 900
apple 1100
peach 1500
peach 800
peach 1200' | awk 'NF>=2{sum[$1]+=$2}END{for(i in sum){print i" "sum[i]}}'

orange 4500
apple 2000
peach 3500

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详细看脚本:

NF >= 2 {                   # Want at least two fields
    sum[$1] += $2           # For each line, add to sum for that key
}
END {                       # After all lines processed.
    for (i in sum) {        # Process each key in sum array
        print i" "sum[i]    # Output key and sum
    }
}