Brace Expansion

The Bash feature “brace expansion” is not present in sh. For example, when executing the following code in sh and in bash:

echo foo{1,2,3}

In sh, the output will be literal:

foo{1,2,3}

In bash it will be expanded to

foo1 foo2 foo3

Advice

To avoid brace expansion, the string can be put in quotes:

echo 'foo{1,2,3}'

Alternatively, the special characters in the string can be escaped:

echo foo\{1,2,3\}