mkbackup.sh

#!/bin/bash

usage_exit(){
  echo "[*] Usage: $0 [-w] [-n suffix_num] [-f] [-o output_dir] filename"
  echo
  echo "backup a file as {filename}.{date}[.{suffix_num}]"
  echo "    -w: bachup without suffix_num"
  echo "    -n: set suffix_num"
  echo "    -f: cp without -i option"
  echo "    -o: output to directory"
  echo
  echo "developed by h-otter"
  exit 1
}

while getopts :n:wfo: OPT
do
  case $OPT in
    w)  WITHOUT_FLAG=1
        ;;
    n)  FILE_NUM=$OPTARG
        ;;
    f)  FORCE_FLAG=1
        ;;
    o)  OUTPUT_PATH=$OPTARG
        ;;
    \?) usage_exit
        ;;
  esac
done
shift $((OPTIND - 1))

if [ $# != 1 ]
then 
  usage_exit
fi

# vars
SUFFIX_DATE=`date +%Y%m%d`
FULL_PATH=`readlink -f $1`
FILE_NAME=`basename $1`
DIR_PATH=${FULL_PATH%/*}

# make new path
if [ ! -z "${OUTPUT_PATH+x}" ]
then
  new_path=$OUTPUT_PATH/$FILE_NAME
else
  new_path=$DIR_PATH/$FILE_NAME
fi

# make new filename
if [ ! -e $new_path.$SUFFIX_DATE ] || [ $WITHOUT_FLAG ]
then
  new_file=$new_path.$SUFFIX_DATE
elif [ ! -z "${FILE_NUM+x}" ]
then
  new_file=$new_path.$SUFFIX_DATE.$FILE_NUM  
else
  FILE_NUM=1
  while [ -e $new_path.$SUFFIX_DATE.$FILE_NUM ]
  do
    FILE_NUM=$(( FILE_NUM + 1 ))
  done
  new_file=$new_path.$SUFFIX_DATE.$FILE_NUM
fi

if [ $FORCE_FLAG ]
then
  cp -p $FULL_PATH $new_file
else
  cp -pi $FULL_PATH $new_file
fi

if [ $? == 0 ]
then
  echo "[+] Finished backup to $new_file"
else
  echo "[-] Error backup to $new_file"
fi