单项选择题
An operator needs to transfer several files in the same directory using ftp without being prompted. Which of the following ftp subcommands must be used?（）
A. int put *
B. int mput *
C. prompt put *
D. prompt mput *
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What is the default configuration file used by the sendmail command?（）
A. /etc/rc/rc.mail
B. /etc/mail.config
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An operator is asked to verify the exact location of the default JRE binary. The following commands were run: $ which java /usr/bin/java $ ls -l /usr/bin/java lrwxrwxrwx 1 root other 23 Jan 27 2006 /usr/bin/java -> ../jre1.5.0_06/bin/java Based on the command outputs above, what is the path to the java executable file?（）
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B. /usr/jre1.5.0_06/bin/java
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What command would an operator use to move a file from the /old_dir directory to the /new_dir directory without changing the file name?（）
A. mv /old_dir/file /new_dir
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