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All unknown characters, including multi-byte unicode ones, after the initial backslash appear to not interrupt the input processing like known commands do.
MariaDB [test]> \a
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ERROR: Unknown command '\a'.
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-> \s
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--------------
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mysql Ver 15.1 Distrib 10.6.7-MariaDB, for Linux (x86_64) using EditLine wrapper
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Connection id: 23
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Current database: test
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Current user: maxuser@127.0.0.1
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SSL: Not in use
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Current pager: stdout
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Using outfile: ''
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Using delimiter: ;
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Server: MariaDB
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Server version: 10.6.5-MariaDB-1:10.6.5+maria~focal-log mariadb.org binary distribution
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Protocol version: 10
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Connection: 127.0.0.1 via TCP/IP
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Server characterset: utf8mb4
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Db characterset: utf8mb4
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Client characterset: utf8mb3
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Conn. characterset: utf8mb3
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TCP port: 3000
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Uptime: 21 min 7 sec
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Threads: 7 Questions: 1042 Slow queries: 0 Opens: 39 Open tables: 33 Queries per second avg: 0.822
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--------------
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-> ;
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ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '\a' at line 1
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Even more interestingly, it seems to keep both collecting the result as well as parse it for any new commands:
MariaDB [test]> \a
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ERROR: Unknown command '\a'.
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-> \p
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--------------
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\a
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--------------
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-> \p
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--------------
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\a
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--------------
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-> \p
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--------------
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\a
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--------------
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-> \p
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--------------
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\a
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--------------
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-> ;
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ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '\a' at line 1
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This results in some confusing situations where you don't know why the client expects more input when normally it would stop after a backslash command.
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