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As far as I know, in bash, you have to enable both globstar and dotglob to be able to match any file recursively with a single pattern:

shopt -s globstar dotglob
echo **/*

See:

man bash |...

If the dotglob option is enabled, then * matches any file exept the hard
links to the current and parent directories (. and ..):


shopt -s dotglob
echo *
shopt -u dotglob