determine_nlines: Determine number of lines in a text file

In LaF: Fast Access to Large ASCII Files

Description

Determine number of lines in a text file

Usage

determine_nlines(filename)

Arguments

filename

character containing the filename of the file of which the lines are to be counted.

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 specified, or random lines.

Examples

# Create temporary filename
tmpcsv  <- tempfile(fileext="csv")

# Generate file
writeLines(letters[1:20], con=tmpcsv)

# Count the lines
determine_nlines(tmpcsv)

# Cleanup
file.remove(tmpcsv)

LaF documentation built on March 26, 2020, 6:59 p.m.