我在 Mac 10.7.5 上使用 MySql 5.5。从外壳（我正在使用 bash）中，我希望能够运行一个命令来截断所有表中的数据。另外，我想输入一个不会提示我输入密码的命令。我试过这个，我在另一个 SO 帖子上找到的，但没有骰子。我可以用来截断所有数据库表数据的 shell 命令是什么？
mysql -umyuser -p -e 'SET FOREIGN_KEY_CHECKS = 0; show tables' my_db | while read table; do mysql -e -umyuser -p "truncate table $table" my_db; done
Enter password:
mysql Ver 14.14 Distrib 5.5.25, for osx10.6 (i386) using readline 5.1
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Usage: mysql [OPTIONS] [database]
-?, --help Display this help and exit.
-I, --help Synonym for -?
--auto-rehash Enable automatic rehashing. One doesn't need to use
'rehash' to get table and field completion, but startup
and reconnecting may take a longer time. Disable with
--disable-auto-rehash.
(Defaults to on; use --skip-auto-rehash to disable.)
-A, --no-auto-rehash
No automatic rehashing. One has to use 'rehash' to get
table and field completion. This gives a quicker start of
mysql and disables rehashing on reconnect.
--auto-vertical-output
Automatically switch to vertical output mode if the
result is wider than the terminal width.
-B, --batch Don't use history file. Disable interactive behavior.
(Enables --silent.)
--character-sets-dir=name
Directory for character set files.
--column-type-info Display column type information.
-c, --comments Preserve comments. Send comments to the server. The
default is --skip-comments (discard comments), enable
with --comments.
-C, --compress Use compression in server/client protocol.
-#, --debug[=#] This is a non-debug version. Catch this and exit.
--debug-check Check memory and open file usage at exit.
-T, --debug-info Print some debug info at exit.
-D, --database=name Database to use.
--default-character-set=name
...