Write both stdout and stderr to the same file 

do_something.sh &> out.log

June 5, 2012 — bashoneliners

Explanation

Note: this is not always the same as:

do_something.sh >out.log 2>out.log

Using &> will ensure that the order of lines coming from stdout and stderr is preserved.

Limitations

This works in /bin/bash and may not work in /bin/sh or other stripped down variants of bash.

logging file-redirection