Shell Programming and Scripting

    { SPane:{ 
        title:"Blinking effect",
        description:"Control the way the LED blinks."
    }},
    { SCheckBox:{
        description:"Completely disable led notifications.", 
        label:"Disable LED",
        default:0,
                action:"generic /sys/class/sec/led/led_completely_disable"
    }},
    { SCheckBox:{
        description:"If disabled, the controller bypasses slope generation.", 
        label:"Enable LED fading",
        default:1,
                action:"generic /sys/class/sec/led/led_fade"
    }},
    { SSeekBar:{
        title:"Fade-in time period",
        description:"Sets the time period of the rising slope.",
        min:0, max:12, unit:"ms", step:1,
        default:2,
                action:"generic /sys/class/sec/led/led_fade_in_time"
    }},
    { SSeekBar:{
        title:"Fade-out time period",
        description:"Sets the time period of the falling slope.",
        min:0, max:20, unit:"ms", step:1,
        default:8,
                action:"generic /sys/class/sec/led/led_fade_out_time"
    }},

echo "$(cat config.json | grep default: | awk -F default '{print $2 }' | awk -F , '{print $1 }')" > def;

:0
:1
:2
:8

$ grep default: config.json >def

#!/bin/bash

#following command requires bash 4
readarray -t arr <def
index=0

function replace {
 echo "${arr[$index]}"
 index=$((index+1))
}

while IFS= read line
do
  if [[ "$line" =~ "default:" ]]; then
   replace
  else
   echo "$line"
  fi
done <config.json >config.json.new

# mv config.json.new config.json

#!/system/bin/sh

line[4]:readarray: not found
line[14]: syntax error: '=~' unexpected operator/operand

while IFS= read -r line
do
  case $line in
    (*default:*) IFS= read -r line <&3
  esac
  printf "%s\n" "$line"
done <config.json 3<def >config.json.new

# mv config.json.new config.json

awk '/default:/ {sub (/.*default/,""); sub (/,.*/,","); print}' config.json >def

sed '/default:/!d; s/.*default//; s/,.*/,/' config.json >def

while read line
do
  case $line in
  *default:*)
    read replace <&3
    echo "$line" | sed 's/\(.*default\)[^,]*\(.*\)/\1'"$replace"'/'
  ;;
  *)
    echo "$line"
  esac
done < config.json 3< def > config.json.new
# mv config.json.new config.json