[SOLVED] Is there command like `seq`, that performs full bash-like brace expansion to stdout?

Is there command like `seq`, that performs full bash-like brace expansion to stdout?

In Bash it is often convenient to use brace expansion to nested directory trees, e.g.

mkdir -p {foo,bar}/baz{0..9}

This works until the expansion is too big for a single ARGV array. A convenient alternative would be command-x, which is like seq but accepts the same brace expansions as bash, e.g.

command-x "{a..z}/{a..z}/{a..z}" | xargs mkdir -p
command-x "{a..z}/{a..z}/{a..z}" | parallel -m mkdir -p

Before I reinvent a wheel does command-x exist?

The closest I've found so far are implementations as libraries (e.g. https://pypi.org/project/bracex/, https://pypi.org/project/braceexpand/, https://github.com/micromatch/braces). If nothing turns up I may offer a CLI interface to one of the Python ones.

Solution

The "needs to fit in argv" limitation only applies to external commands, not to shell builtins.

Thus, the shell builtin printf is suited to purpose:

printf '%s\n' {a..z}/{a..z}/{a..z} | xargs -d $'\n' mkdir -p --

...or, better, use printf '%s\0' and xargs -0 to pass through all possible arguments (and all possible filenames), a set which includes content with literal newlines.