Shell Programming and Scripting

#----------------

FILENAME="$1"
SCRIPT=$(basename $0)

#-----------------------------------------//

function usage
{
echo "\nUSAGE: $THIS_SCRIPT  file_to_process\n"
echo "OR - To send the output to a file use: "
echo "\n$THIS_SCRIPT  file_to_process  > output_file_name 2>&1 \n"
exit 1
}

#-----------------------------------------//
append(){
lr=$1
val=$3
size=$2

if [ $1 = "l" ]
then
    echo "$val" >> 2           
else
    val=$(printf "%${size}s" "$val")
    echo "$val" >> 2
   echo "ap no"
fi

}

#-----------------------------------------//

function readline
{

    #while read line
sed 1d $FILENAME | while read line
    do
        echo "$line"
        
#Srl. No,Deleted ?,Field,Size,Alignment,Value

        del=`echo "$line" | cut -d , -f2`
del=${del:-"n"}
del=${del,,}
        size=`echo "$line" | cut -d , -f 4`
        lr=`echo "$line" | cut -d , -f 5`
#echo "$lr"
lr=${lr:-"l"}
lr=${lr,,}
#echo "$lr"

        val=`echo "$line" | cut -d , -f 6`
a=$del
#if [ ${a:-"n"} = "n" -o ${a:-"n"} = "N" ]
if [ ${a:-"n"} = "n" ]
then
append "$lr" "$size" "$val"

echo "okok"
fi
    #done < $FILENAME
done

}

# **************MAIN*************** #

# Looking for exactly one parameter
(( $# == 1 )) || usage

# Does the file exist as a regular file?
[[ -f $1 ]] || usage


readline

cat 2
tr -d '\n' <2 >3

function readline
{
oldifs=$IFS
IFS=,
sed 1d $FILENAME | while read srl del fld size lr val
do
        del=${del:-"n"}
        del=${del,,}
        lr=${lr:-"l"}
        lr=${lr,,}
        a=$del
        if [ ${a:-"n"} = "n" ]
        then
            append "$lr" "$size" "$val"
            echo "okok"
        fi
done
IFS=$oldifs
}

append(){
lr=$1
val=$3
size=$2
if [ $1 = "l" ]
then
    echo "$val" >> 2
else
    printf -v val "%${size}s" "$val"
    echo "$val" >> 2
   echo "ap no"
fi
}

function append(){
lr=$1
val=$3
pad=$2

#echo ${#val}
#echo $pad
#pad=${#pad}-${#val}
let pad=$pad-${#val}
echo $pad

while [ "$pad" -gt 0 ]
do
        if [ "$lr" = "l" ]
        then
                val=$val" "
                let pad=$pad-1
        else
                val=" "$val
                let pad=$pad-1
        fi
done

echo "[$val]"
echo "$val" >> 2
}