How to determine the destination of standard output?

[Bernd Felsche]

In <1991Feb6.204432.2850 at cubmol.bio.columbia.edu> ping at cubmol.bio.columbia.edu (Shiping Zhang) writes:

>I'm not sure if this subject has be discussed before. I want to know
>if there is a way to tell within a program where its standard output
>goes. More specifically, if the output goes to the terminal screen, or
>goes to a pipe, or is redirected into a disk file. Thanks for any info.

Refer to fstat(2) for System V.

This gives you inode info for a file descriptor.

There is also isatty(3), which tells you if it is.

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