Tandy 1000 MS-DOS User Manual

Chapter 3 / Redirecting Commands
Filters
A filter is a command that operates on data in some way before
outputting it-usually to the screen or a file. The MS-DOS fil-
ters and functions are:
• FIND - Searches for occurrences of a requested string
of text in a file.
• MORE -
Causes screen output to be displayed, one
screen at a time. To view the next screen, press any key.
• SORT -
Sorts text from A-Z or from Z-A (reverse sort).
Note: By combining commands and filters, you
can replace several commands with a few filters,
as described below.
Command Piping
Piping lets you give more than one command at a time to the
system. It does this by making one command's output another
command's input.
To pipe commands, divide them with the pipe separator, the ver-
tical
bar ( I ). (You produce the vertical bar by pressing 4 on the
keypad when the [NUM LOCK I key is off or by pressing [SHIFT I 4 on
the keypad when the [NUM LOCK) key is on.) All output generated
by
the command to the left of the bar becomes input for the com-
mand to the right.
For example, you can sort your directory listing. Type:
d i r I 5 0 r t [ENTER I
to display an alphabetically sorted listing of the current direc-
tory.
This command:
d i r I so r t >d irE' C • f i 1 [ENTER I
sends the same listing to the file Direc.fil in the current direc-
tory.
If the file does not exist, MS-DOS creates it.
d i r b: I >b : d irE' C • f i 1 [ENTER I
makes an alphabetically sorted listing of the current directory of
Drive B
and sends the listing to the file Direc.fil in the home
directory on Drive B. MS-DOS
creates the file, if necessary.
20

Tandy 1000 MS-DOS Specifications

General

Brand	Tandy
Model	1000 MS-DOS
Category	Desktop
Language	English