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Help needed in Korn Shell scripting

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# 1  
Old 02-25-2013
Code Help needed in Korn Shell scripting

#! /bin/ksh

while read line
  if [[ ${#line} -lt 45 ]] ; then
   echo "no data"
  echo "performing operation on $line"
done < prg.txt

# 2  
Old 02-25-2013
Ok. What is your question?
# 3  
Old 02-25-2013
Want a Korn shell script which reads the records in a file and at a specific position it is to be checked whether tht is blank.

dhgadjhkwdkwyuywu gdwyduyweeduy
xvgjdwtdjtwktdtwtdt udedeiueduuedu

suppose tht one line in file is of 100 characters nd position 20-28 have to be checked for blank or empty string.

Please help...
using awk will be preferred

---------- Post updated at 06:57 AM ---------- Previous update was at 06:55 AM ----------

the above code is what i have tried but tht works only if the position we are checking is the last position in the file
# 4  
Old 02-25-2013

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