Hi all,
I'm looking for command that print any number of lines from a given
file.
For example file1.txt contains 100 lines
using the head command I can printout the first n lines from
file1.txt.
using the tail command I can printout the n last lines from file1.txt
How to do for printing out a block of lines, let say from the 50 th
line to 68 th line ?
I used this but it fails

file_name="file1.txt"

if [ -f  $file_name ] ;then
  tail +$1 $3 | head -n$2
fi

Another question:
How to detect the total number of lines from a given file?
knowing this it will help me to use a for loop to echo all lines that
I want to print.
cheers