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[Linux][awk] awkでログ集計(合計, 平均)

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ログ集計時にたまに使って毎回調べてるのでメモ

入力例

test.log
A 1.1 funcA1()
B 1.2 funcB1()
C 1.3 funcC1()
A 2.4 funcA2()
B 2.5 funcB2()
C 2.6 funcC2()

使用例

合計

すべての合計
$ cat test.log | awk '{sum+=$2} END {print sum}'
11.1
Bの合計
$ cat test.log | awk '/^B\s.*$/{sum+=$2} END {print sum}'
3.7

平均

すべての平均
$ cat test.log | awk '{sum+=$2} END {print sum/NR}'
1.85
Aの平均
$ cat test.log | grep -E "^A\s.*$" | awk '{sum+=$2} END {print sum/NR}'
1.75

(抽出した場合の個数を簡単に出す方法がわからなかったので、前段でgrepを使ってます・・・)

参考

Awkワンライナー (最小値、最大値、合計、平均、中央値) - それがしの足音
統計屋のためのAWK入門 - あんちべ!

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