Note: Removed in v0.3.3 - 2014-05-29

echo "$"

echo "\$"

$ is special in double quotes, but there are some cases where it's interpreted literally:

1. Following a backslash: echo "\$"
2. In a context where the shell can't make sense of it, such as at the end of the string, ("foo$") or before some constructs ("$'foo'").

To avoid relying on strange and shell-specific behavior, any $ intended to be literal should be escaped with a backslash.