error output redirection

Stefan Miklosovic miklosovic.freebsd at
Sun Oct 11 21:36:53 UTC 2009

hi list,

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

if I "cat" file which do not exist, error is on screen,
I want to add that error to some file (errors.txt)

thank you

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