Help needed in Korn Shell scripting

Shell Programming and Scripting
1 
#! /bin/ksh

while read line
do
  if [[ ${#line} -lt 45 ]] ; then
   echo "no data"
   continue;
  fi
  echo "performing operation on $line"
done < prg.txt
2

Ok. What is your question?

3

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.
eg-

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

Double post, continue here: