Home : Perl : File I/O

File I/O

Opening a file

`open(`FILE`, "`filename`");`		Open filename for reading.
`open(`FILE`, "<`filename`");`		Open filename for reading.
`open(`FILE`, ">`filename`");`		Open filename for writing. The file is truncated if it already exists.
`open(`FILE`, ">>`filename`");`		Open filename for writing. The file is appended if it already exists.
`open(`FILE`, "+<`filename`");`		Open filename for reading and writing.

FILE is the file handle name (the convention is to use all uppercase).

Reading from a file

`$`scalar `= <`FILE`>;`		Read one line (including the end-of-line sequence) from the file.
`@`array `= <`FILE`>;`		Read the entire file, one line (including the end-of-line sequence) per array element.

Writing to a file

print FILE "Text\n";

Closing a file

close(FILE);