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/etc/security/user 文件里有项属性“su”可以控制能否su到某用户，如下：
su Indicates whether another user can switch to the specified user account with the su command.
Possible values are:
true Another user can switch to the specified account. This is the default.
false Another user cannot switch to the specified account
su Indicates whether another user can switch to the specified user account with the su command.
Possible values are:
true Another user can switch to the specified account. This is the default.
false Another user cannot switch to the specified account