How to count lines in a file and add an arbitrary number to the result?

Question

I have a file that contains 'x' lines in it.

I need to display the number of lines in such file and add 'y'.

I know that wc -l does the trick and displays 'x' as the output, how can it be so that the output would be 'x+y'?

Answer 1

You could do like this,

$ wc -l file
13 yi
$ y=12
$ wc -l file | awk -v var=$y '{print $1+var}'
25