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I need help program in C... :create a program that runs two processes linked oven

I need to print out text from a file in the console up...not all tasks ... This is here just for show

yes...I need to print out text from a file in the console up

I need to print out text from a file in the console up

I need to print out text from a file in the console up, you know someone like that?

thank you,
One more thing printed by lines will be shown up, do not know how?

this works:
cat file.txt| awk 'NR==45,NR==55'
but how do I assign variables instead of numbers:
this does not work:
cat file.txt | awk 'NR==$start,NR==$end'

there need variables instead of...

Create a program that will subsequently list the contents of the file / files specified on the command line. Printed by the rows will be shown up.

Description of the command:
scrollfile [options]...

thank you

I have a text file in which you need to identify the number of lines that looks like this:

awk '{x + +} END {print x}' filename

The problem is that I do not know how this data to any variable...