uni backup script in progress

#1/bin/bash

# usage statement to tell users how to use this script.
USAGE=$(
  cat <<EOF
$0 [OPTIONS]
-h      Display the first 5 lines of a file to be backed up.
-c      To count the files backed up
-v      Enable verbosity
-m      The Month to start backups from
-y      The Year to start backups from
-d      The Date to start backups from
-b      The target directory to backup
EOF
)

# variables, set these ones to zero so we have a baseline to work with.
HEAD="0"
COUNT="0"
VERBOSE="0"
GDATE="0"
MONTH="0"
YEAR="0"

# set these variables to something useful
DIR=`pwd`
TARGET="$HOME/.backup/"
CURMONTH=`date '+%y%m'`

# used to set bold/normal fonts in terminal.
BOLD=`tput bold`
NORM=`tput sgr0`

# show usage if nothing was specifed.
if [ $# -eq 0 ]
  then
    echo "$USAGE"
    exit 1
fi

# get runtime options
while getopts ":hcvxm:y:d:b:" OPTION; do
  case "$OPTION" in
    h) HEAD=1;;
    c) COUNT=1;;
       # verbosity isn't used yet.
    v) VERBOSE=1;;
    x) echo "$USAGE"
       exit 1;;
       # if statement to check that the month string given is numeric, starts with valid numbers and is 2 digits long.
    m) if (( `echo "$OPTARG" | grep -E '^[0-1][[:digit:]]{1}'` ))
         then
           MONTH="$OPTARG"
       else
         echo "${BOLD}Month must be entered in the correct format - please try again :)${NORM}"
         exit 1
       fi ;;
       # if statement to check that the year string given is numeric, starts with valid numbers and is 4 digits long.
    y) if (( `echo "$OPTARG" | grep -E '^2[[:digit:]]{3}'` ))
          then
            YEAR="$OPTARG"
       else
         echo "${BOLD}Year must be entered in the correct format - please try again :)${NORM}"
         exit 1
       fi ;;
       # need to add error checking to date specified to make sure it's a real date.
    d) GDATE="$OPTARG";;
    b) TARGET="$OPTARG";;
  esac
done

# set backup date. can we use the other date for this?
if (( "$MONTH" != "0" )) && (( "$YEAR" != "0" ))
  then
    # the user specified a month and year, so we'll select the 1st day of the month.
    BDATE=`echo "$YEAR$MONTH""01" |  sed 's ..  '`
elif (( "$GDATE" == "0" ))
  then
    # because a day isn't set, we'll choose the 1st day of the month.
    BDATE="$CURMONTH""01"
else
    # we'll use the date specified by the user
    BDATE="$GDATE"
fi

# print the header of each file to be backed up, if specfiied
if (( "$HEAD" == "1" ))
  then
    # find searches the pwd for all files newer than the date specified based on modification timestamp and pipes it to head to display the first 5 lines.
    HEADERS=`find "$DIR" -newermt "$BDATE" -print0 | xargs -0 head -n 5 -`
    echo "${BOLD}Printing out first 5 lines of EVERY file to be backed up.${NORM}"
    echo "$HEADERS"
fi

# print how many files are to be backed up
if (( "$COUNT" == "1" ))
  then
    # find searches the pwd for all files newer than the date specified based on modification timestamp and pipes it to wc to count how many there are.
    NUMFILES=`find "$DIR" -newermt "$BDATE" -print | wc -l`
    echo "${BOLD}Files to be backed up: $NUMFILES ${NORM}"
fi

# backup files modified after a certain date
echo "${BOLD}Backing up specified files now.${NORM}"
# find searches the pwd for all files newer than the date specified based on modification timestamp, these are then sent to tar to backup and bzip2.
`find "$DIR" -newermt "$BDATE" -print0 | xargs -0 tar -cjf "$TARGET"backup-"$GDATE".tar.bz2 > /dev/null 2>&1`
echo "${BOLD}Files have been successfully backed up.${NORM}"

exit 0
#END OF FILE