Bash count occurences based on parameters-CodePudding

I'm new to bash shell and I have to do a script with a csv file.

The file is a list of the participants, countries, sports and medals achieved.

when executing the script, I should give as parameters the nationality (column 3) and the sport (column 8). The script should return the amount of participants of that country for that sport, and the amount of medals achieved.

The amount of medals achieved is the sum of the columns "gold" "silver" "bronze" of each row which are columns 9,10 and 11.

I cannot use grep, awk, sed or csvkit.

So far, I have this code but I'm stuck with the medal counting part.

nacionality=$1
sport=$2
columns= cut -d, -f 3,8 athletes.csv
echo columns | tr -cd $nacionality,$sport | wc -c

Could anyone help me?

The file is: https://github.com/flother/rio2016/blob/master/athletes.csv

The name of the file is script2_4.sh

An example of the output is:

./script2_4.sh POL rowing

 Participants, Medals


 26, 6

A sample of the file:

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,

CodePudding user response：

Here is a pure bash implementation. Build a hash from field name to position ($h):

#!/bin/bash

file=athletes.csv
nationality=$1
sport=$2

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"

and example output:

$ head -4 athletes.csv  | ./script2_4.sh CAN athletics
Participants, Medals
1, 1