Section Seven - Filer reference

This section describes the more advanced features of the Filer popdown, and should be read in conjunction with The Filer. The features described here include:

Directories, and the hierarchical filing system
The Command Line Interpreter, and CLI files

Here, you will find the following chapters:

Specifying filenames in full

Describes filename syntax, filename extensions, directory structure, device specifications and wildcards.

Additional Filer Commands

Describes commands that provide facilities for creating directories, manipulating files within the hierarchical directory structure.

CLI files

Describes how to use the Command Line Interpreter with text files, reference of special commands for the CLI, redirecting of I/O and how to utilize this for editing BBC BASIC programs in PipeDream.

Specifying file names in full

The full form of a file name is

:DEVICE I DIRECTORY I DIRECTORY I .... /filename

where DIRECTORY and filename are each of the form

name.extension

consisting of a name of up to 12 letters or digits, followed by an optional extension of up to three letters or digits,

The following extensions are used for system functions:

.sgn

For

symb_square.png

+K and

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+S CLI files

.CLI

For BOOT.CLI; see CLI files, p. 173.

.L

For PipeDream multi-file List file

DIRECTORY is a directory name subject to the same constraints as filename.

In addition the following symbols can be used:

`../name`	Parent directory of name
.	Current directory

Device specifications

DEVICE can be specified as one of the following:

Specification		Effect

Specification		Effect
`:RAM.0`		RAM in slot 0 (internal memory)
`:RAM.1`		RAM in slot 1 (external memory)
`:RAM.2`		RAM in slot 2 (external memory)
`:RAM.3`		RAM in slot 3 (external memory)
`:RAM.-`		Any RAM memory; ie 0, 1, 2, or 3. Used by CLI for temporary files, and lost on reset.
`:ROM.0`		ROM
`:SCR.0`		Screen
`:PRT.0`		Printer; via printer driver so that highlight codes are interpreted
`:COM.0`		Communications; via serial port
`:INP.0`		Standard input
`:OUT.0`		Standard output
`:NUL.0`		Null: absorbs output, and acts like an empty file on input

Note: RAM . - files must be deleted before a soft reset is performed with Operating Systems up to and including 3.0.

Wildcards

The device, directory and file name can contain the following wildcards:

`*`		Matches any number of characters (or none)
`?`		Matches a single character
`//`		Matches any number of directories (or none)