Bash redirection: since `&> foo` means `> foo 2>&1`, is there a `&>>`?

Question

Following would redirect the Stdout and Stderr to logfile:

$ command &> logfile

How do I do this redirection without overwrite logfile during next run of command. Something like >> if it was a plain redirection.

Answer 1

You could attach stderr (2) to stdout (1) and then redirect stdout in append-mode:

command >> logfile 2>&1

The 2>&1 bit attaches stderr to stdout and then you redirect stdout to append to logfile in the usual manner.

Answer 2

From the BASH manual

The format for appending standard output and standard error is:
       &>>word
This is semantically equivalent to
       >>word 2>&1

So, $ command &>> logfile.

EDIT: The shorthand version seems to be a feature in bash version 4, so for compability reasons you should use command >> logfile 2>&1.