mysql的登陆和退出命令格式

mysql -h [hostip] -u [username] -p [password] [database] 

select user();
  select database();

mysql> help

For information about MySQL products and services, visit:
  http://.mysql./
For developer information, including the MySQL Reference Manual, visit:
  http://dev.mysql./
To buy MySQL Enterprise support, training, or other products, visit:
  https://shop.mysql./

List of all MySQL mands:
Note that all text mands must be first on line and end with ';'
?     (\?) Synonym for `help'.
clear   (\c) Clear the current input statement.
connect  (\r) Reconnect to the server. Optional arguments are db and host.
delimiter (\d) Set statement delimiter.
edit   (\e) Edit mand with $EDITOR.
ego    (\G) Send mand to mysql server, display result vertically.
exit   (\q) Exit mysql. Same as quit.
go    (\g) Send mand to mysql server.
help   (\h) Display this help.
nopager  (\n) Disable pager, print to stdout.
notee   (\t) Don't write into outfile.
pager   (\P) Set PAGER [to_pager]. Print the query results via PAGER.
print   (\p) Print current mand.
prompt  (\R) Change your mysql prompt.
quit   (\q) Quit mysql.
rehash  (\#) Rebuild pletion hash.
source  (\.) Execute an SQL script file. Takes a file name as an argument.
status  (\s) Get status information from the server.
system  (\!) Execute a system shell mand.
tee    (\T) Set outfile [to_outfile]. Append everything into given outfile.
use    (\u) Use another database. Takes database name as argument.
charset  (\C) Switch to another charset. Might be needed for processing binlog with multi-byte charsets.
warnings (\W) Show warnings after every statement.
nowarning (\w) Don't show warnings after every statement.
resetconnection(\x) Clean session context.

For server side help, type 'help contents'