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单选题 Given the following script, why does the output come out as an empty line instead of "dog"?()

A

The $VAR variable was not exported

B

The $VAR should have been set as VAR

C

dog needs double quotes around it when setting $VAR

D

The { } should not be around VAR in the echo command

单选题 How is an IP address removed from a network interface?()

A

rmdev -dl ent0

B

ifconfig en0 down

C

ifconfig en0 delete

D

ifconfig ent0 detach

单选题 During reboot the system hangs with an LED 0554 message that means, "The boot device could not be opened or a read failed." What recovery procedures should be taken?()

A

Boot in maintenance and use fsck to check hd5.

B

Boot in maintenance mode, access the rootvg and check the /etc/inittab for corruption.

C

Boot in maintenance mode, access the rootvg and rebuild the boot image using the bosboot command.

D

Boot in maintenance mode, access the rootvg and use the bootlist command to create a valid boot list.

单选题 What command would be used to restart the mail daemon?()

A

sendmail -bi

B

refresh -s sendmail

C

restart -a sendmail

D

/etc/sendmail.cf -stop  /etc/sendmail.cf -start

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