Linux-Foundation LFCS Questions Answers

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Linux-Foundation LFCS Sample Questions

Question # 1

To prevent a specific user from scheduling tasks with at, what should the administrator do? 

A. Add the specific user to /etc/at.allow file.  
B. Add the specific user to [deny] section in the /etc/atd.conf file.  
C. Add the specific user to /etc/at.deny file.  
D. Add the specific user to nojobs group.  
E. Run the following: atd --deny [user].  

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Question # 2

Which of the following is the device file name for the second partition on the only SCSI drive?

A. /dev/hda1 
B. /dev/sda2 
C. /dev/sd0a2 
D. /dev/sd1p2 

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Question # 3

Which of the following commands will reduce all consecutive spaces down to a single space?

A. tr '\s' ' ' < a.txt > b.txt 
B. tr -c ' ' < a.txt > b.txt 
C. tr -d ' ' < a.txt > b.txt 
D. tr -r ' ' '\n' < a.txt >b.txt 
E. tr -s ' ' < a.txt > b.txt

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Question # 4

Which of the following commands will NOT update the modify timestamp on the file /tmp/myfile.txt? 

A. file /tmp/myfile.txt  
B. echo "Hello" >/tmp/myfile.txt  
C. sed -ie "s/1/2/" /tmp/myfile.txt  
D. echo -n "Hello" >>/tmp/myfile.txt  
E. touch /tmp/myfile.txt  

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Question # 5

After moving data to a new filesystem, how can the former path of the data be kept intact in order to avoid reconfiguration of existing applications? (Choose TWO correct answers.)

A. By creating an ACL redirection from the old to the new path of the data. 
B. By creating a hard link from the old to the new path of the data.
 C. By creating a symbolic link from the old to the new path of the data. 
D. By running the command touch on the old path. 
E. By mounting the new filesystem on the original path of the data. 

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Question # 6

In Bash, inserting 1>&2 after a command redirects 

A. standard error to standard input.  
B. standard input to standard error.  
C. standard output to standard error.  
D. standard error to standardoutput.  
E. standard output to standard input.  

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Question # 7

Which command is used to add an empty group to the system? (Specify ONLY the command without any path or parameters.)

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Question # 8

When starting a program with the nice command without any additional parameters, which nice level is set for the resulting process?

A. -10  
B. 0  
C. 10  
D. 20  

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Question # 9

In order to display all currently mounted filesystems, which of the following commands could be used? (Choose TWO correct answers.)

A. cat /proc/self/mounts 
B. free 
C. mount 
D. lsmounts
 E. cat /proc/filesystems

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Question # 10

What is the default name of the configuration file for the Xorg X11 server? (Specify the file name only without any path.) 

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Question # 11

Which of the following are tasks handled by a display manager like XDM or KDM? (Choose TWO correct answers.)

A. Start and prepare the desktop environment for the user. 
B. Configure additional devices like new monitors or projectors when they are attached. 
C. Handle the login of a user. 
D. Lock the screen when the user was inactive for a configurable amount of time. 
E. Create an X11 configuration file for the current graphic devices and monitors. 

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Question # 12

Which of the following is a valid IPv6 address? 

A. 2001:db8:3241::1  
B. 2001::db8:4581::1  
C. 2001:db8:0g41::1  
D. 2001%db8%9990%%1  
E. 2001.db8.819f..1  

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Question # 13

Which of the following Linux filesystems preallocates a fixed number of inodes at the filesystem's make/creation time and does NOT generate them as needed? (Choose TWO correct answers.)

A. ext3  
B. JFS  
C. ext2  
C. ext2  
E. procfs  

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Question # 14

When running the command sed -e "s/a/b/" /tmp/file >/tmp/file While /tmp/file contains data, why is /tmp/file empty afterwards?

A. The file order is incorrect. The destination file must be mentioned before the command to ensure redirection.
B. The command sed did not match anything in that file therefore the output is empty. 
C. When the shell establishes the redirection it overwrites the target file before the redirected command starts and opens it for reading. 
D. Redirection for shell commands do not work using the > character. It only works using the | character instead. 

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Question # 15

The presence of what file will temporarily prevent all users except root from logging into the system? (Specify the full name of the file, including path.)

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Linux-Foundation LFCS Reviews