C Send Output To Dev Tty Online
To send text to a terminal you may redirect standard output of some command-line command to the appropriate special file. For example typing 'echo test /dev/ttyS1' at the command prompt should send the word 'test' to the terminal on ttyS1 (COM2) provided you have write permission on /dev/ttyS1.
Linux Dev Tty
Syntax
Remarks
These are standard streams for input, output, and error output.
By default, standard input is read from the keyboard, while standard output and standard error are printed to the screen.
The following stream pointers are available to access the standard streams:
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| Pointer | Stream |
|---|---|
stdin | Standard input |
stdout | Standard output |
stderr | Standard error |
These pointers can be used as arguments to functions. Some functions, such as getchar and putchar, use stdin and stdout automatically.
These pointers are constants, and cannot be assigned new values. The freopen function can be used to redirect the streams to disk files or to other devices. The operating system allows you to redirect a program's standard input and output at the command level.
See also
Stream I/O
Global Constants