Shell Programming and Scripting

#declare variables to be used.
help=-1
count=0
JanCount=0
FebCount=0
MarCount=0
AprCount=0
MayCount=0
JunCount=0
JulCount=0
AugCount=0
SepCount=0
OctCount=0
NovCount=0
DecCount=0

# process all arguments (loop while $1 is present)
while [ -n "$1" ] ; do

 case $1 in
  -h*|-H*)		echo "Enter in a Year or a Month and Year to count the number of 

accesses made during that period." ; help=0 ;
			shift ;;

  [12][0-9][0-9][0-9])	the_year=$1 ;
			shift ;;

  Jan*|jan*|JAN*)      	the_month="Jan" ; shift ;;
  Feb*|feb*|FEB*)      	the_month="Feb" ; shift ;;
  Mar*|mar*|MAR*)      	the_month="Mar" ; shift ;;
  Apr*|apr*|APR*)      	the_month="Apr" ; shift ;;
  May*|may*|MAY*)      	the_month="May" ; shift ;;
  Jun*|jun*|JUN*)      	the_month="Jun" ; shift ;;
  Jul*|jul*|JUL*)      	the_month="Jul" ; shift ;;
  Aug*|aug*|AUG*)      	the_month="Aug" ; shift ;;
  Sep*|sep*|SEP*)      	the_month="Sep" ; shift ;;
  Oct*|oct*|OCT*)      	the_month="Oct" ; shift ;;
  Nov*|nov*|NOV*)      	the_month="Nov" ; shift ;;
  Dec*|dec*|DEC*)      	the_month="Dec" ; shift ;;

  *)			echo "? unrecognised input: $1" ;
			shift ;;
 esac
 done

# read the file to count accesses made
oldIFS="$IFS"
while IFS="/:" read day month year rest
    do
        MONTH=$month
	YEAR=$year

	if [ "$the_year" == "$year" ] &&  [ "$the_month" == "$month" ]  
	    then count=`expr $count + 1`
	elif [ "$the_year" == "$year" ] && [ "$the_month" == "" ]
	    then if [ "$month" = "Jan" ]
			then JanCount=`expr $JanCount + 1`
		 elif [ "$month" = "Feb" ]
			then FebCount=`expr $FebCount + 1`
		 elif [ "$month" = "Mar" ]
			then MarCount=`expr $MarCount + 1`
		 elif [ "$month" = "Apr" ]
			then AprCount=`expr $AprCount + 1`
		 elif [ "$month" = "May" ]
			then MayCount=`expr $MayCount + 1`
		 elif [ "$month" = "Jun" ]
			then JunCount=`expr $JunCount + 1`
		 elif [ "$month" = "Jul" ]
			then JulCount=`expr $JulCount + 1`
		 elif [ "$month" = "Aug" ]
			then AugCount=`expr $AugCount + 1`
		 elif [ "$month" = "Sep" ]
			then SepCount=`expr $SepCount + 1`
		 elif [ "$month" = "Oct" ]
			then OctCount=`expr $OctCount + 1`
		 elif [ "$month" = "Nov" ]
			then NovCount=`expr $NovCount + 1`
		 elif [ "$month" = "Dec" ]
			then DecCount=`expr $DecCount + 1`
		 fi
        fi
    done < my_sample_log2.txt
IFS=$oldIFS

# print out the accesses
if [ "$help" != 0 ]
	then if [ "$count" != "0" ]
			then echo "Report:" $count "accesses in $the_month $the_year."
		else
			echo "Report for the year $the_year:"
 			echo "Jan:" $JanCount "accesses."
			echo "Feb:" $FebCount "accesses."
			echo "Mar:" $MarCount "accesses."
			echo "Apr:" $AprCount "accesses."
			echo "May:" $MayCount "accesses."
			echo "Jun:" $JunCount "accesses."
			echo "Jul:" $JulCount "accesses."
			echo "Aug:" $AugCount "accesses."
			echo "Sep:" $SepCount "accesses."
			echo "Oct:" $OctCount "accesses."
			echo "Nov:" $NovCount "accesses."
			echo "Dec:" $DecCount "accesses."
	     fi
fi