error output redirection

[Markiyan Kushnir]

George Davidovich <freebsd at optimis.net> already gave an answer.

Markiyan Kushnir wrote:
> 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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