Quote:

Originally Posted by nj78 If you are familiar with egrep and regular expressions, then just cat the file and pipe to egrep -v to remove what you don't need. Good exercise to learn this, plenty of material to find using google.

Don't cat the file. Use the filename as the final argument to grep.

However, for this exercise, awk is better:

Code:

awk -F '_list' '
 { num = $2; sub( /.prn/, "", num ); num = num + 0 }
 num < 21 || num > 37
' "$FILE"