args_of_read.Rout

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> args(read.csv)        # you have control over sep = ","
function (file, header = TRUE, sep = ",", quote = "\"", dec = ".", 
    fill = TRUE, comment.char = "", ...) 
NULL
> args(read.table)
function (file, header = FALSE, sep = "", quote = "\"'", dec = ".", 
    numerals = c("allow.loss", "warn.loss", "no.loss"), row.names, 
    col.names, as.is = !stringsAsFactors, na.strings = "NA", 
    colClasses = NA, nrows = -1, skip = 0, check.names = TRUE, 
    fill = !blank.lines.skip, strip.white = FALSE, blank.lines.skip = TRUE, 
    comment.char = "#", allowEscapes = FALSE, flush = FALSE, 
    stringsAsFactors = FALSE, fileEncoding = "", encoding = "unknown", 
    text, skipNul = FALSE) 
NULL
> args(readr::read_csv) # comma separated.  use read_csv2 for ";" sep
function (file, col_names = TRUE, col_types = NULL, col_select = NULL, 
    id = NULL, locale = default_locale(), na = c("", "NA"), quoted_na = TRUE, 
    quote = "\"", comment = "", trim_ws = TRUE, skip = 0, n_max = Inf, 
    guess_max = min(1000, n_max), name_repair = "unique", num_threads = readr_threads(), 
    progress = show_progress(), show_col_types = should_show_types(), 
    skip_empty_rows = TRUE, lazy = should_read_lazy()) 
NULL
> args(data.table::fread)
function (input = "", file = NULL, text = NULL, cmd = NULL, sep = "auto", 
    sep2 = "auto", dec = ".", quote = "\"", nrows = Inf, header = "auto", 
    na.strings = getOption("datatable.na.strings", "NA"), stringsAsFactors = FALSE, 
    verbose = getOption("datatable.verbose", FALSE), skip = "__auto__", 
    select = NULL, drop = NULL, colClasses = NULL, integer64 = getOption("datatable.integer64", 
        "integer64"), col.names, check.names = FALSE, encoding = "unknown", 
    strip.white = TRUE, fill = FALSE, blank.lines.skip = FALSE, 
    key = NULL, index = NULL, showProgress = getOption("datatable.showProgress", 
        interactive()), data.table = getOption("datatable.fread.datatable", 
        TRUE), nThread = getDTthreads(verbose), logical01 = getOption("datatable.logical01", 
        FALSE), keepLeadingZeros = getOption("datatable.keepLeadingZeros", 
        FALSE), yaml = FALSE, autostart = NA, tmpdir = tempdir(), 
    tz = "UTC") 
NULL
> 
> proc.time()
   user  system elapsed 
  0.452   0.046   0.487