#!/bin/bash

out=""

usage () {
  echo
  echo "Usage: $0 <full path to log file>"
  echo

  exit 1
}

if [ $# -ne 1 ]; then
    usage;
fi

# empty file
>"$1"

echo "Reading lines from /dev/kmsg .." >/dev/stderr

cat "/dev/kmsg" | while IFS= read -r LINE; do
    out=`date`
    echo "$LINE" | sed -e "s/^.*;/$out /" >>"$1"
done

exit 0