Change values from a dataset variable in Bash-CodePudding

I am new in Bash and I am trying to change the values of a column from the file data.csv coma delimitted.

In the dataset I have the variable sex with only 2 possible values 'Female' and 'Male' and I would like to transform Male into 'm' and Female into 'f'. I have tried this:

#!/bin/bash
sex=$(cut -d , -f 5 data.csv) #I select column 5 related with the variable sex
for i in $sex; do
    if [[$i='Female']]; then
    $i='f'
    fin
done

The code is wrong and I do not know how to modify it.

Besides, I would like to update my data.csv with the new values in sex.

CodePudding user response：

awk -F , -v OFS=, '
$5 == "Female" {$5 = "f"}
$5 == "Male" {$5 = "m"} 1' data.csv

CodePudding user response：

# awk
# without header
awk -F, 'BEGIN{OFS=FS}{$5=="Male" ? $5="m" : $5="f"}1' data.csv > output1.csv
# with header
awk -F, 'BEGIN{OFS=FS} NR!=1{$5=="Male" ? $5="m" : $5="f"}1' data.csv > output1.csv

# bash
while read line 
do
    line=${line/,Male,/,m,}
    line=${line/,Female,/,f,}
    echo $line
done  < data.csv > output2.csv

# sed
sed 's/,Male,/,m,/; s/,Female,/,f,/' data.csv > output3.csv