R : readLines : Read text lines from a file

By using readLines() method, you can read some/all text lines from a file/connection.

Syntax

readLines(con = stdin(), n = -1L, ok = TRUE, warn = TRUE,

          encoding = "unknown", skipNul = FALSE)

Parmeter	Description
con	Represens connection object to a file
n	Maximum number of lines to read. If n is negative, it should read up to the end of input on the connection.
ok	It is Boolean variable. Is it OK to reach the end of the connection before n > 0 lines are read? If not, an error will be generated.
warn	It is a Boolean variable. Warn if a text file is missing a final EOL or if there are embedded nuls in the file.
encoding	Encoding to be assumed for input strings.
skipNul	If it is TRUE, then null values are skipped, else not.

Let’s say “output.txt” contain following data.

first line

second line

third line

> fileConn <- file("output.txt")
> data <- readLines(fileConn)
> close(fileConn)
> 
> data
[1] "first line"  "second line" "third line" 

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