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Перенаправление вывода в linux(unix) - Output redirection in linux(unix)

echo test > afile.txt ..redirects stdout to afile.txt. This is the same as doing..
echo test 1> afile.txt To redirect stderr, you do..
echo test 2> afile.txt>& is the syntax to redirect a stream to another file descriptor - 0 is stdin. 1 is stdout. 2 is stderr.
You can redirect stdout to stderr by doing..
echo test 1>&2# or echo test >&2 ..or vice versa:
echo test 2>&1 So, in short.. 2> redirects stderr to an (unspecified) file, appending &1 redirects stderr to stdout

In the shell, what does “ 2>&1 ” mean?Crontab, want to mail just errors to myself AND log output in separate file
Some additional INFO:
Основы системного администрирования Linux: работа с консолью
Техническая библиотека IBM - Linux 101