如果已设置这个别名，那么在切换到新文件夹之后tcsh会执行cmdcwd映射到的命令。
If this alias is set, then TCSH executes the command that CMDCWD was aliased to after switching to a new folder.
因此，任何有权在SYSTEM.COM MAND .INPUT或它的别名上传递或设置身份上下文的用户都有可能使用其他userid的权限发出命令。
Therefore any user that has the authority to pass or set identity context on SYSTEM.COMMAND.INPUT or its alias can, potentially, issue a command with some other userid's authority.
或许您正在执行一份需要大量的命令行来处理参数的工作或者您想要设置一些别名。
Perhaps you are performing a job requiring a lot of command-line processing with arguments and would like to set a few aliases.
别名机制最适合于您希望设置单个命令的命令行选项的情况，虽然也可以使用它们来将给定的命令展开为一组命令或管道。
The alias system works best where you want to set the command-line options on an individual command, although they can be used to expand a given command into a set of multiple commands, or pipes.
别名在以下情况下最为有用：您希望使用base命令并容易地指定附加选项，同时仍然允许设置特定于平台的选项。
Aliases are most useful in those situations where you want to use the base command and easily specify additional options, while still allowing for platform-specific options to be set.
别名在以下情况下最为有用：您希望使用base命令并容易地指定附加选项，同时仍然允许设置特定于平台的选项。
Aliases are most useful in those situations where you want to use the base command and easily specify additional options, while still allowing for platform-specific options to be set.
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