Read lines from a file or string by chunk.

read_lines_chunked(
  file,
  callback,
  chunk_size = 10000,
  skip = 0,
  locale = default_locale(),
  na = character(),
  progress = show_progress()
)

read_lines_raw_chunked(
  file,
  callback,
  chunk_size = 10000,
  skip = 0,
  progress = show_progress()
)

Arguments

file

Either a path to a file, a connection, or literal data (either a single string or a raw vector).

Files ending in .gz, .bz2, .xz, or .zip will be automatically uncompressed. Files starting with http://, https://, ftp://, or ftps:// will be automatically downloaded. Remote gz files can also be automatically downloaded and decompressed.

Literal data is most useful for examples and tests. To be recognised as a path, it must be wrapped with I(), be a string containing at least one new line, or be a vector containing at least one string with a new line.

Using a value of clipboard() will read from the system clipboard.

callback

A callback function to call on each chunk

chunk_size

The number of rows to include in each chunk

skip

Number of lines to skip before reading data.

locale

The locale controls defaults that vary from place to place. The default locale is US-centric (like R), but you can use locale() to create your own locale that controls things like the default time zone, encoding, decimal mark, big mark, and day/month names.

na

Character vector of strings to interpret as missing values. Set this option to character() to indicate no missing values.

progress

Display a progress bar? By default it will only display in an interactive session and not while knitting a document. The automatic progress bar can be disabled by setting option readr.show_progress to FALSE.

See also