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?（）

单项选择题What is the default configuration file used by the sendmail command?（）

A. /etc/rc/rc.mail
B. /etc/mail.config
C. /etc/sendmail.config
D. /etc/mail/sendmail.cf

单项选择题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?（）

A. /usr/bin/java
B. /usr/jre1.5.0_06/bin/java
C. /usr/bin/jre1.5.0_06/bin/java
D. /usr/bin/java/jre1.5.0_06/bin/java

单项选择题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
B. mv -p /old_dir/file /new_dir
C. mv -k /old_dir/file /new_dir
D. mv /old_dir/file /new_dir/new_file

单项选择题Which of the following commands will show the users that are logged on a system ?（）

A. id
B. who
C. whois
D. lsuser

单项选择题An Operator is in var tmp and needs to go to var adm. Which of the following is correct?（）

A. cd /adm
B. cd ./adm
C. cd ../adm
D. cd /../adm