How to find number of lines of a Large CSV file without reading it - using R?

Asked May 06 '19 at 23:23

Active May 06 '19 at 23:33

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It is required to find the number of lines of a pretty big CSV file (about 100 GB) without reading it completely -- since it doesn't fit inside the RAM. What is the MOST OPTIMIZED way to achieve this in R ?

Edit: I have already tried out the following

reading a text file in R line by line

Read Large File line by line in R without header

But seems to be pretty slow - for just finding number of rows ...

edited May 06 '19 at 23:33

asked May 06 '19 at 23:23

Ajay

Thanks mate ... But it seems to be very slow for large files ... – Ajay May 06 '19 at 23:34
Answer depends somewhat on your operating system and if Windows, whether Rtools is installed? – neilfws May 06 '19 at 23:37
1

The answers in the duplicate are missing a useful option: `R.utils::countLines()`. – neilfws May 06 '19 at 23:47

How to find number of lines of a Large CSV file without reading it - using R?

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