"New features in Bash 4 include two new redirection operators;
&>> which sends standard output and standard errors to a
named file, and |&, synonymous with 2>&1 |, which
redirects standard error to a pipe. Associative arrays can now be
created using declare -A name, which allows for arrays to be
indexed by arbitrary strings.
"A new ** expansion operator has been added; where * would
expand to all files and directories in the current directory, **
expands to all files in the current directory and all directories
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