I have a really big file and somehow new data is appended to the end of the file. I only need to read the new data of this file. But now I have to read from the head of this file an scan the whole file.
Is there a good way to start read file from a specific line number? Or is there another way to solve it around?
You can use the tail
command from your shell, and use that inside ruby, like this:
lines = `tail -n 10 your_file.txt`
You can also install a gem named elif
, which basically works like a regular File
module, but allows you to read the file backwards :)
gem install elif
Now, you can do something like this to get the last line from your file:
Elif.open('your_file.txt', &:gets)
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