Redirecting Command Input and Output
WinOne® allows Standard Input and Standard Output to be redirected on the command
line and assumes that Standard Input comes from the keyboard and that Standard
Output goes to the screen. The default Standard Input and Standard Output can be
redirected using the following characters on the command line :-
The less than sign ( ie. ' < ' ) to use the contents of a file as the input
for a command. For example :-
SORT < filename
The greater than sign ( ie. ' > ' ) to send the output from a command to a
file. When the specified file does not exist, it is created and when the file does
exist, it is over written, and the previous contents are lost. For example :-
SORT > filename
The double greater than sign (ie. ' >> ' ) appends the output from a command
to the end of a file. . For example :-
SORT >> filename
The bar character ( ie. ' | ' ) allows the Standard Output from one command
to be used as the Standard Input to another command. This is referred to as a pipe.
For example :-
TYPE filename | SORT | MORE
The commands TYPE, SORT and
MORE are executed in that order, that is from left to right.
- When using redirection with text mode type programs, the executed task can not be
placed in the background. For more information on placing a program in the background
see Command Execution and Precedence.
Copyright © 1995-2018 Lucien Cinc, All Rights Reserved
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