reem006.sh

#!/bin/bash

printUsage() {
  echo "Usage: reem006 <input-file> <line-number>"
  exit 1
}

compareArray() {
  local counter=$1

  if [ ${#TARGET_LINE[@]} != ${#TMP_LINE[@]} ]; then
      return
  fi

  for ((i=0; i < ${#TARGET_LINE[@]}; i++)); do
    local c1=${TARGET_LINE[i]}
    local c2=${TMP_LINE[i]}
    if [ -n "$c1" ] && [ -z "$c2" ]; then
      return
    elif [ -z "$c1" ] && [ -n "$c2" ]; then
      return
    fi
  done
  printf "%06d\n" ${counter}
}

getTargetLine() {
  local counter=0
  local IFS=
  while read row; do
    if [ "$2" == "${counter}" ]; then
      echo ${row} | tr '\t' '\n' > tmp.txt
      while read column; do
        TARGET_LINE+=("${column}")
      done < "tmp.txt"
      return
    fi
    let counter=${counter}+1
  done < "$1"
}

readLines() {
  local counter=0
  local IFS=
  while read row; do
    if [ ${counter} -eq 0 ]; then
      :
    elif [ ${counter} -eq $2 ]; then
      :
    else
      echo ${row} | tr '\t' '\n' > tmp.txt
      TMP_LINE=()
      while read column; do
        TMP_LINE+=("${column}")
      done < "tmp.txt"
      compareArray ${counter}
    fi
    let counter=${counter}+1
  done < "$1"
}

if [ $# -ne 2 ]; then
  printUsage
fi

declare -a TARGET_LINE=()
declare -a TMP_LINE=()
getTargetLine $1 $2
readLines $1 $2