More Letter Writing Information Knowing how to write business letters is an essential skill so here are several more articles for you: Start with the basics on how to write a business letter using a general format and review various business letter templates.
For output, print and syswrite are used for both text and binary data you decide whether to make the output line-oriented by printing newlines.
On Macintosh systems, users can change the source of the three standard filehandles by selecting filenames from a dialog box within the MacPerl development environment. Left justify your letter.
Tips for Formatting Your Letter When writing a letter, your letter should be simple and focused, so that the purpose of your letter is clear. It takes the name of the filehandle to set as the default, and returns the name of the previous default.
Input and Output Operations Perl gives you the option of reading from a filehandle one line at a time, suitable for text files, or reading from it in chunks of arbitrary length, suitable for binary byte streams like image files.
Depending on how it was created, a filehandle may be connected to a disk file, to a hardware device such as a serial port, to a local process such as a command-line window in a windowing system, or to a remote process such as a network server.
Most line-oriented network servers also use CRLF to terminate lines.See Appendix C for a brief summary. STDERR "standard error" is used for error messages, diagnostics, debugging, and other such incidental output. Instead of specifying the encoding, you tell Perl that your data are in raw bytes. Leave a blank line after the salutation and before the closing. The EOF condition is signaled differently depending on whether you are reading from the filehandle one line at a time or as a byte stream. This behavior is discussed in more detail later in the Buffering and Blocking section. Most line-oriented network servers also use CRLF to terminate lines. Standard Filehandles A filehandle connects a Perl script to the outside world. We discuss this later in the Buffering and Blocking section. If it is used to assign to a scalar variable, a so-called scalar context, it reads a line of text from the indicated filehandle, returning the data along with its terminating end-of-line character. No two operating system designers can seem to agree on how lines should end in text files.