what is easily done with tee for stdout cannot be done for stderr. Looks like there is no easy way to make a pipeline using stderr separately from stdout. If you want to watch output of the stderr separately from stdout, you might manage for it in two consoles:

 % foo 2>err

 % tail -f err

Markiyan.

Nerius Landys wrote:
if error output of some program appear on screen,
it is possible to print it also to some file simultaneously ?

Since you said "simultaneously", it made me think of the command tee.  man tee?
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