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

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