Bash function to parse ini configuration files

parse_ini_bash.sh

#!/bin/bash

function iniget() {
  if [[ $# -lt 2 || ! -f $1 ]]; then
    echo "usage: iniget <file> [--list|<section> [key]]"
    return 1
  fi
  local inifile=$1

  if [[ "$2" == "--list" ]]; then
    SECTIONS=$(cat "$inifile" | grep "\[" | sed -e "s#\[##g" | sed -e "s#\]##g")
    for section in $SECTIONS; do
      echo $section
    done
    return 0
  fi

  local section=$2
  local key
  [ $# -eq 3 ] && key=$3

  # https://stackoverflow.com/questions/49399984/parsing-ini-file-in-bash
  # This awk line turns ini sections => [section-name]key=value
  local lines=$(awk '/\[/{prefix=$0; next} $1{print prefix $0}' $inifile)

  if [ ! -z $section ]; then
    section_lines=$(echo $lines | grep "\[$section\]" | sed -e "s/^\[$section\]//")
  fi

  if [ ! -z "$key" ]; then
    value=$(echo $section_lines | awk -F "=" "/${key}/ {print \$2}")
    echo $value
  else
    echo $section_lines
  fi
}