stdin, stdout and stderr

Bash:

• Read one line from stdin and assign words to variables
• Redirection
• echo writes its argument to standard out.

/dev/stdin, dev/stdout and /dev/stderr

tty

Using head to show a directory's largest n files

gets() in the standard C library.

R functions scan(), stdin

The Python built-in function input reads a line from stdin

Python: The attributes stdin, stdout and stderr of the sys module.

The .NET class System.Console

This Java example starts a new process and then reads the process's stdout to repeat it on the own stdout.

The In, Out and Error properties of the .NET System.Console class.