Redirection of stdout and stderr

Some notes on redirection, this article has a good summary. I hold these patterns in my head, but had long since forgotten what the syntax actually meant. Send stdout and stderr to the same file:

./generatesomeoutput &> some_file

Send stderr to stdout:

./generatesomeoutput 2>&1

which is filedescriptor '2' (stderr) to file descriptor '1' (stdout), and the '&' indicates that '1' is a filedescriptor not a filename.