./console exp:configphp --help
./console exp:config:list --help
./console exp:config:get --help
./console exp:config:set --help
./console exp:config:unset --help
php bin/php/configphp.php --help

The define() settings of config.php

  ./console exp:config:list [--only-set] [--format=text|json]     every setting config.php-RECOMMENDED documents, with
                                                                 the value config.php has, the proposed one and the description
  ./console exp:config:get <NAME> [--format=text|json]           the value (exit 1 when it is not set)
  ./console exp:config:set <NAME> <value> [--type=<t>] [--apply] set it: in place, else where the documentation has it, else added
  ./console exp:config:unset <NAME> [--apply]                    comment it out again

config.php is read as PHP tokens, never run; only the value of the one define() changes, comments and
order stay. set and unset show the diff and write nothing without --apply (--dry-run is the default;
both together: exit 2). A write backs config.php up to var/backup/config/<time>/ (mode and owner
kept), checks the new file with php -l and renames it into place. A config.php that does not compile is
refused. Values of names with PASS, SECRET, KEY, TOKEN are shown as ******** unless --show-secrets.
Types (--type): bool, int, octal, float, string, null; without --type the current or the documented
value decides, true/false/null are always the PHP values. A value starting with "-": --value=<value>.