Quoting for shells

Escape special characters in a string, so that it will retain its literal meaning when used as a part of command in a Unix shell.

It tries to avoid introducing any unnecessary quotes or escape characters, but specifics regarding quoting style are left unspecified.

Joins arguments into a single command line suitable for execution in a Unix shell.

Each argument is quoted using quote to preserve its literal meaning when parsed by Unix shell.

Note: This function is essentially an (infallible) inverse of parse.