UNIX has it covered as always with the test command.
UNIX一直通过test命令提供这一功能。
To use the test command, simply provide the command with the appropriate flag and file name.
要想使用test命令，只需给这个命令提供适当的标志和文件名。
To use the test command, simply provide the command with the appropriate flag and file name.
要想使用test命令，只需给这个命令提供适当的标志和文件名。
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