Question

I am accessing a file, and before I append to it, I want to delete the last line from the file. Is there any efficient way of doing this in Ruby?

This is what I am using to access the file:

file = File.new("imcs2.xml", "a")

Answer 1

Assuming you want to remove the entire last line of the file, you can use this method which locates the start of the last line and begins writing from there:

last_line = 0
file = File.open(filename, 'r+')
file.each {  last_line = file.pos unless file.eof? }

file.seek(last_line, IO::SEEK_SET)
#Write your own stuff here
file.close