Cut Command error cut: Bad range

Shell Programming and Scripting
1

Hi
Can anyone what I am doing wrong while using cut command.

for f in *.log
  do
    logfilename=$f
    Log "Log file Name: $logfilename"
    logfile1=`basename $logfilename .log`
    flength=${#logfile1}
    Log "file length $flength"
    from_length=$(($flength - 15))
    Log "from length $from_length"
    logfile_date=`echo $logfile1 | cut -c ${from_length}-8`
    Log "Logfile date with stringlength $logfile_date"
done

Getting error in cut command for a file as
INT_put_daily_stock_tax_to_ML_20110520_002258
I want use cut command.

The error is showing

+ + echo INT_put_daily_stock_tax_to_ML_20110520_002258 
+ cut -c 30-8 
cut: Bad range "30-8" in list

Don't know what is wrong when used cut command.

2

A range must be lower - upper values
From 30 to 8 mean's nothing.

3

Thank you