我想解析 a.csv 文件并取最后一行并将其存储在一个数组中，然后在终端上显示一些 select 值

Question

so I am currently displaying the last line of a csv file using tail -n 1 file1.csv. That results in the values being displayed in one line just separated by commas. I want to be able to display a few select values by doing this echo "Value 3: $VALUES[2]" . So put the result of tail into an array VALUES and then be able to pick what values I want to display.

Answer 1

With mapfile which is a bash4+ feature

#!/usr/bin/env bash

mapfile -td, VALUES < <(tail -n 1  file1.csv)

for i in "${!VAlUES[@]}"; do
  echo "$i" "${VALUES[$i]}"
done

---

If mapfile is not available.

#!/usr/bin/env bash

IFS=, read -ra VALUES < <(tail -n 1  file1.csv)

for i in "${!VAlUES[@]}"; do
   echo "$i" "${VALUES[$i]}"
done

---

I want to be able to display a few select values by doing this echo "Value 3: $VALUES[2]"

echo "Value 3: ${VALUES[2]}"