Bash 根据参数计算出现次数

Question

我是 bash shell 的新手，我必须使用 csv 文件编写脚本。

该文件列出了参与者、国家、运动项目和获得的奖牌。

执行脚本时，我应该将 nationality（第 3 列）和 sport（第 8 列）作为参数提供。该脚本应 return 该国家参加该运动的人数，以及获得的奖牌数。

获得的奖牌数量是每行第 9,10 和 11 列“金牌”“银牌”“铜牌”列的总和。

我无法使用 grep、awk、sed 或 csvkit。

到目前为止，我已经有了这段代码，但我被奖牌计数部分卡住了。

nacionality=
sport=
columns= cut -d, -f 3,8 athletes.csv
echo columns | tr -cd $nacionality,$sport | wc -c

谁能帮帮我？

文件是：https://github.com/flother/rio2016/blob/master/athletes.csv

文件名是script2_4.sh

输出示例为：

./script2_4.sh POL rowing

 Participants, Medals


 26, 6

文件样本：

id,name,nationality,sex,date_of_birth,height,weight,sport,gold,silver,bronze,info
736041664,A Jesus Garcia,ESP,male,1969-10-17,1.72,64,athletics,0,0,0,
532037425,A Lam Shin,KOR,female,1986-09-23,1.68,56,fencing,0,0,0,
435962603,Aaron Brown,CAN,male,1992-05-27,1.98,79,athletics,0,0,1,
521041435,Aaron Cook,MDA,male,1991-01-02,1.83,80,taekwondo,0,0,0,
33922579,Aaron Gate,NZL,male,1990-11-26,1.81,71,cycling,0,0,0,
173071782,Aaron Royle,AUS,male,1990-01-26,1.80,67,triathlon,0,0,0,
266237702,Aaron Russell,USA,male,1993-06-04,2.05,98,volleyball,0,0,1,
382571888,Aaron Younger,AUS,male,1991-09-25,1.93,100,aquatics,0,0,0,
87689776,Aauri Lorena Bokesa,ESP,female,1988-12-14,1.80,62,athletics,0,0,0,
997877719,Ababel Yeshaneh,ETH,female,1991-07-22,1.65,54,athletics,0,0,0,
343694681,Abadi Hadis,ETH,male,1997-11-06,1.70,63,athletics,0,0,0,
591319906,Abbas Abubakar Abbas,BRN,male,1996-05-17,1.75,66,athletics,0,0,0,
258556239,Abbas Qali,IOA,male,1992-10-11,,,aquatics,0,0,0,
376068084,Abbey D'Agostino,USA,female,1992-05-25,1.61,49,athletics,0,0,0,
162792594,Abbey Weitzeil,USA,female,1996-12-03,1.78,68,aquatics,1,1,0,
521036704,Abbie Brown,GBR,female,1996-04-10,1.76,71,rugby sevens,0,0,0,
149397772,Abbos Rakhmonov,UZB,male,1998-07-07,1.61,57,wrestling,0,0,0,
256673338,Abbubaker Mobara,RSA,male,1994-02-18,1.75,64,football,0,0,0,
337369662,Abby Erceg,NZL,female,1989-11-20,1.75,68,football,0,0,0,
334169879,Abd Elhalim Mohamed Abou,EGY,male,1989-06-03,2.10,88,volleyball,0,0,0,
215053268,Abdalaati Iguider,MAR,male,1987-03-25,1.73,57,athletics,0,0,0,
763711985,Abdalelah Haroun,QAT,male,1997-01-01,1.85,80,athletics,0,0,0,

Answer 1

这是一个纯粹的 bash 实现。构建从字段名称到位置 ($h) 的哈希：

#!/bin/bash

file=athletes.csv
nationality=
sport=

IFS=, read -a l < "$file"
declare -A h
for pos in "h${!l[@]}"
do
    h["${l[$pos]}"]=$pos
done

declare -i participants=0
declare -i medals=0
while IFS=, read -a l
do
    if [ "${l[${h["nationality"]}]}" = "$nationality" ] &&
        [ "${l[${h["sport"]}]}" = "$sport" ]
    then
    ((participants++))
        medals=$((
        $medals +
        "${l[${h["gold"]}]}" +
        "${l[${h["silver"]}]}" +
        "${l[${h["bronze"]}]}"
    ))
    fi
done < "$file"
echo "Participants, Medals"
echo "$participants, $medals"

前 4 行输入的示例输出：

$ ./script2_4.sh CAN athletics
Participants, Medals
1, 1

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