[Solved] This script is intended to print the third column of a CSV file:while IFS=',' read -r col1 col2 col3; do echo $col3; done file.csvBut it does not work. What is the problem? | Bash Scripting

Bash Scripting - File Operations in Scripts

This script is intended to print the third column of a CSV file:

while IFS=',' read -r col1 col2 col3; do echo $col3; done file.csv

But it does not work. What is the problem?

AMissing input redirection '<' before file.csv

BUsing read -r disables field splitting

CEcho does not print variables correctly

DIFS should be set after read command

Step-by-Step Solution

Solution:

Step 1: Check how input is provided to while loop
while loop reads from standard input; file.csv must be redirected with '<'.
Step 2: Identify missing redirection
Script lacks '< file.csv', so loop reads nothing and prints nothing.
Final Answer:
Missing input redirection '<' before file.csv -> Option A
Quick Check:
Use '< file.csv' to feed file into while loop [OK]

Quick Trick: Redirect input with '<' to read file lines in while loop [OK]

Common Mistakes:

MISTAKES

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This script is intended to print the third column of a CSV file: