Determine number of lines in a text file

Description

Determine number of lines in a text file

Usage

determine_nlines(filename)

Arguments

Details

The routine counts the number of line endings. If the last line does not end in a line ending, but does contain character, this line is also counted.

The file size is not limited by the amount of memory in the computer.

Value

Returns the number of lines in the file.

See Also

See readLines to read in all lines a text file; get_lines and sample_lines can be used to read in spcified, or random lines.

Examples

# Generate file
writeLines(letters[1:20], con="tmp.csv")

# Count the lines
determine_nlines("tmp.csv")

Results

R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
Copyright (C) 2016 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.

R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.

> library(LaF)
> png(filename="/home/ddbj/snapshot/RGM3/R_CC/result/LaF/determine_nlines.Rd_%03d_medium.png", width=480, height=480)
> ### Name: determine_nlines
> ### Title: Determine number of lines in a text file
> ### Aliases: determine_nlines
> 
> ### ** Examples
> 
> # Generate file
> writeLines(letters[1:20], con="tmp.csv")
> 
> # Count the lines
> determine_nlines("tmp.csv")
[1] 20
> 
> 
> 
> 
> 
> dev.off()
null device 
          1 
>