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Bash script not respecting the IFS setting when reading from a file

πŸ‘€ Views: 3 πŸ’¬ Answers: 1 πŸ“… Created: 2025-05-31
bash IFS input

I'm wondering if anyone has experience with I'm dealing with I've been struggling with this for a few days now and could really use some help... I've been struggling with this for a few days now and could really use some help. I'm working with an scenario where my Bash script doesn't seem to respect the `IFS` (Internal Field Separator) variable when reading lines from a file. I want to split the lines based on a custom delimiter, but it seems to be ignoring my settings. Here’s a simplified version of what I have: ```bash #!/bin/bash IFS=':' while read -r field1 field2; do echo "Field 1: $field1" echo "Field 2: $field2" done < input.txt ``` The `input.txt` file contains lines like this: ``` value1:value2 value3:value4 ``` When I run this script, I expect it to output: ``` Field 1: value1 Field 2: value2 Field 1: value3 Field 2: value4 ``` but instead, I get: ``` Field 1: value1:value2 Field 2: Field 1: value3:value4 Field 2: ``` I've tried placing the `IFS` variable inside the `while` loop as well, but the behavior remains the same. I've also confirmed that there are no leading or trailing spaces in the `input.txt` file. Is there something I'm missing here regarding how `IFS` is applied or how `read` processes the input from a file? This is part of a larger service I'm building. My development environment is Ubuntu. I'd really appreciate any guidance on this. For context: I'm using Bash on Ubuntu 22.04. This is my first time working with Bash LTS. How would you solve this? This is for a web app running on Windows 11. Has anyone else encountered this? I'm using Bash 3.9 in this project.