Each of these channels (controlled via a file descriptor 0, 1, or 2 - stdin, stdout, stderr) can be redirected to a file, another device or a pipe connecting its process to another process. The process is normally unaware of such I/O redirection, thus simplifying prototyping of combinations of commands.
The C programming language library includes routines to perform basic operations on standard I/O.
Examples are "printf", allowing text to be sent to standard output, and "scanf", allowing the program to read from standard input.
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standard for robot exclusion
Standard for the exchange of product model data
Standard Generalised Markup Language
Standard Generalized Markup Language
Standard Instrument Control Library