how to return certain line of a file 2

[zhenning]

For example, if the input of the script is 3, I need to get the 3rd line from the bottom of the file as the output. How can I make it?

Thanks a lot!

Zhenning

 

[feherke]

Hi

A one-liner. ( The red 3 shows where to put the order number of the desired line. )

perl -n -e '$n=[red]3[/red];' -e '$l[$.%$n]=$_;END{print$l[($.+1)%$n]}' /input/file

Feherke.

http://rootshell.be/~feherke/

 

[KevinADC]

Use the Tie::File module and you can access the lines of a file like an array. The third to last line would be index -3 in the tied array.

------------------------------------------
- Kevin, perl coder unexceptional!

 

[zhenning]

Thank you for all the applies! it worked for me!