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A more vague request I've never seen!

Please follow the rules for posting here.

Closed.

as in, make the console go backwards?

This can vary depending on your terminal since it's not a standard feature, but the escape sequence "ESC M" moves the terminal up one line in at least some.
...

awk -v start=$whatever -v end=$wherever 'NR==start,NR==end' file.txt


or


sed -n "$start,$end p" file.txt


--ahamed

No need to use cat (http://partmaps.org/era/unix/award.html):
awk -v s=$start -v e=$end 'NR==s,NR==e' file

You mean something like this?


line_no=$(awk '{x++} END {print x}' filename)
echo $line_no


--ahamed

PS : Please use code tags. Thank you for your co-operation.