[Ecls-list] How do I determine if *standard-input* is coming from an interactive terminal

[William Bland]

Hi,

I'm using ECLS to write some command-line unix programs, and I need to
determine if *standard-input* is coming from an interactive terminal,
e.g. someone said:

$ myprogram arg1 ... argn

or if *standard-input* is being redirected from a pipe or a file, e.g.

$ myprogram arg1 ... argn < file
or
$ otherprogram | myprogram arg1 ... argn

Any suggestions?

Thanks and best wishes,
Bill.