The origin of stderr (fd 2) #unix #c
The Unix Heritage Society (TUHS) mailing list is an ongoing source of interesting historical tid bits, here are a couple about the original of stderr:
- The stderr file pointer was born so that error messages could go to the terminal instead of to the typesetter in order to save money.
- File 2 is the error file; it is an output file, nor- mally the same as file 1, except that when file 1 is diverted via a command line ’>’ operator, file 2 remains attached to the original destination, usually the terminal.
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