Shell Programming and Scripting

#!/bin/ksh

### Functions ###

is_digit()
{
        strLen=${#1}
        check_no=$(echo $1 | tr -d '[0-9]')
        if [[ $strLen -eq 5 && $check_no = "" ]]
        then
                return $SUCCESS
        else
                return $FAIL
        fi
}
is_string()
{
        strLen=${#1}
        check_no=$(echo $1 | tr -d '[A-Za-z]')
        if [[ $strLen -eq 5 && $check_no = "" ]]
        then
                return $SUCCESS
        else
                return $FAIL
        fi
}
validate()
{
        vRecord=$1
        vField=$2
        if [[ $vField -eq 1 || $vField -eq 4 ]]  # FOR FIELDS 1 AND 4
        then
                is_digit $vRecord
                if [[ $? -eq $SUCCESS ]]
                then
                        return $SUCCESS
                else
                        return $FAIL
                fi
        fi
        if [[ $vField -eq 2 ]]                  # FOR FIELDS 2
        then
                is_string $vRecord
                if [[ $? -eq $SUCCESS ]]
                then
                        return $SUCCESS
                else
                        return $FAIL
                fi
        fi
        if [[ $vField -eq 5 ]]                 # FOR FIELDS 5
        then
                if [[ $vRecord = "N" || $vRecord = "Y" ]]
                then
                        return $SUCCESS
                else
                        return $FAIL
                fi
        fi
        if [[ $vField -eq 24 || $vField -eq 25 ]]  # FOR FIELDS 24 AND 25
        then
                tmpStr=$(echo $vRecord | sed 's/[A-Z]\{3\}//')
                if [[ $tmpStr = "" ]]
                then
                        return $SUCCESS
                else
                        return $FAIL
                fi
        fi
        if [[ $vField -ge 7 && $vField -le 17 ]] || [[ $vField -ge 19 && $vField -le 23 ]] # FOR 7-17 AND 19-23
        then
                tmpStr=$(echo $vRecord | sed 's/[0-9]//')
                if [[ $tmpStr = "" ]]
                then
                        return $SUCCESS
                else
                        return $FAIL
                fi
        fi


}

### Main ###

export FAIL=1
export SUCCESS=0
InpFile=$1
NO_OF_COLUMNS=25
for line in `cat $InpFile | tr -d ' '`
do
        PRINT_FLAG=0
        field_no=1
        while [[ $field_no -le $NO_OF_COLUMNS ]]
        do
                fRecord=$(echo $line | cut -d',' -f$field_no)
                validate $fRecord $field_no
                if [[ $? -eq $FAIL ]]
                then
                        PRINT_FLAG=1
                        break;
                fi
                field_no=$((field_no+1));
        done
        if [[ $PRINT_FLAG -eq $SUCCESS ]]
        then
                echo $line
        fi
done

echo 12:30:00:00 | sed 's/\([0-9]\{1,2\}:[0-9]\{1,2\}:[0-9]\{1,2\}\).*/\1/'
12:30:00

Time=12:30:00:00
New_time=${Time%:*}
echo $New_time