MySQL修改prompt时可以使用到的特殊符号：
| Option | Description |
|---|---|
\c |
A counter that increments for each statement you issue |
\D |
The full current date |
\d |
The default database |
\h |
The server host |
\l |
The current delimiter (new in 5.1.12) |
\m |
Minutes of the current time |
\n |
A newline character |
\O |
The current month in three-letter format (Jan, Feb, …) |
\o |
The current month in numeric format |
\P |
am/pm |
\p |
The current TCP/IP port or socket file |
\R |
The current time, in 24-hour military time (0–23) |
\r |
The current time, standard 12-hour time (1–12) |
\S |
Semicolon |
\s |
Seconds of the current time |
\t |
A tab character |
\U |
Your full |
\u |
Your user name |
\v |
The server version |
\w |
The current day of the week in three-letter format (Mon, Tue, …) |
\Y |
The current year, four digits |
\y |
The current year, two digits |
\_ |
A space |
\ |
A space (a space follows the backslash) |
\' |
Single quote |
\" |
Double quote |
\\ |
A literal “\” backslash character |
\ |
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