#! /bin/bash
historyfile=$1
if [ $# != 1 ];then
  echo "Usage: read-history historyfile"
  exit 1
fi

while read line
do
  echo $line | grep "^#[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]$" &> /dev/null
  if [ "$?" = "0" ];then
    historytime=`date -d "1970-01-01 UTC ${line:1} seconds" "+%F %H:%M:%S"`
    echo -en "$historytime "
  else
    echo -e  $line
  fi
done < $historyfile