Midterm Review For NOS 120

Command to concatenate files and print on the standard output

cat

Which term describes the name of a program to run? Argument Command Option Prompt

command

Which Bash shortcut or command displays the list of previous commands? Pressing Tab !string !number history Pressing Esc+.

history

Which item or file represents the location of the user's personal files? home directory login shell /etc/passwd /etc/group

home directory

Which item represents the program that provides the user's command-line prompt? primary shell home directory login shell command name

login shell

Which directory is the top of the system's file system hierarchy? /etc / /home/root /root

/

Which directory contains persistent, system-specific configuration data? /etc /root /run /usr

/etc

Which directory contains installed software programs and libraries? /etc /lib /usr /var

/usr

Which answer sends output to a file and sends errors to a different file? >file 2>file2 >file 1>file2 >file &2>file2 | tee file

>file 2>file2

Which item represents a number that identifies the group at the most fundamental level? primary group UID GID groupid

GID

Which term describes the part of the command line that adjusts the behavior of a command? Argument Command Option Prompt

Option

Which term describes the visual cue that indicates an interactive shell is waiting for the user to type a command? Prompt Argument Command Option

Prompt

What command can be used to display the last five lines of a text file? a. tail -5 b. stop -5 c. head -5 d. end -5

a. tail -5

Which of the following is the first field of the /etc/passwd file? a. GID b. username c. password d. UID

b. username

Which of the following commands will send the output of the cat command to the grep command to be filtered? a. cat /etc/passwd @ grep jsmith b. cat /etc/passwd > grep jsmith c. cat /etc/passwd | grep jsmith d. cat /etc/passwd >> grep jsmith

c. cat /etc/passwd | grep jsmith

Which of the following commands will create a symbolic link named foo.txt to an original file named bar.txt a. ln -h foo.txt bar.txt b. ln foo.txt bar.txt c. ln -s bar.txt foo.txt d. ln bar.txt foo.txt

c. ln -s bar.txt foo.txt

Command to change the working directory

cd

Which command will change the working directory to /tmp if the current working directory is /home/student? cd tmp cd .. cd ../../tmp cd ~tmp

cd ../../tmp

Which command will always change the working directory to /bin? cd bin cd /bin cd ~bin cd -bin

cd /bin

Which command displays the absolute path name of the current location? cd pwd ls ~ ls -d

pwd

Which of the following commands will delete a directory and all of the files contained within it? (Choose all that apply.) a. rmdir -rf olddir b. rmdir olddir c. rm -rf olddir d. rm olddir

rm -rf olddir

Separate from manual pages, the GNU Project developed a different online documentation system, known as GNU Info. True or False

true

Vim is a text editor to edit all kinds of plain text. True or False

true

Which directory contains user home directories? / /home /root /user

/home

Which answer displays output to a terminal and ignores all errors? &>file 2> &>file 2>/dev/null 1>/dev/null

2>/dev/null

Which directory contains temporary files? /tmp /trash /run /var

/tmp

Which pattern will match only filenames beginning with "b"? b* *b *b* [!b]*

b*

Command to list directory contents

ls

Which term describes the interpreter that executes commands typed as strings? Command Console Shell Terminal

shell

The pinfo reader is more advanced than the original info command. True or False

true

Which Bash shortcut or command re-executes a specific command in the history list? Pressing Tab !number !string history Pressing Esc+.

!number

Which Bash shortcut or command separates commands on the same line? Pressing Tab history ; !string Pressing Esc+.

;

Which item represents a number that identifies the user at the most fundamental level? primary user UID GID username

UID

Command to print the name of the current/working directory

pwd

A program for securely logging into a remote machine and for executing commands on a remote machine. httpd ps ssh more

ssh

Which command will switch to the root user? set root elevate sudo -i be root

sudo -i

Which term describes an interface that provides a display for output and a keyboard for input to a shell session? Console Virtual Console Shell Terminal

terminal

Which directory contains dynamic data, such as for databases, logs, and websites? /etc /run /usr /var

/var

Which answer sends output and errors to the same file ensuring existing file content is preserved? >file 2>file2 &>file >>file 2>&1 >>file 1>&1

>>file 2>&1

Which term describes the part of the command line that specifies the target that the command should operate on? Argument Command Option Prompt

Argument

Which of the following commands can be used to delete a user account? :a. expireuser b. rmuser c. userdel d. deluser

c. userdel

Command to print or echo content to stdout

echo

Command to make a directory

mkdir

Which term describes the hardware display and keyboard used to interact with a system? Physical Console Virtual Console Shell Terminal

physical console

Which Bash shortcut or command is used to complete commands, file names, and options? ; !number history Pressing Tab Pressing Esc+.

pressing tab

What is the fourth field of the /etc/passwd file? home directory UID login shell primary group

primary group

Which pattern will match only filenames where the first character is not "b"? b* *b *b* [!b]*

[!b]*

Which pattern will match only filenames that begin with an uppercase letter? ^?* ^* [upper]* [[:upper:]]* [[CAP]]*

[[:upper:]]*

Which command is used to return to the current user's home directory, assuming the current working directory is /tmp and their home directory is /home/user? cd cd .. cd . cd * cd /home

cd

Which Bash shortcut or command is used to re-execute a recent command by matching the command name? Pressing Tab !number !string history Pressing Esc+.

!string

Which answer discards all messages normally sent to the terminal? >file 2>file2 &>/dev/null &>/dev/null 2>file &>file

&>/dev/null

Which answer sends both output and errors to a file, creating it or overwriting its contents? | tee file 2 &>file 1 &>file &>file

&>file

Which pattern will match only filenames that contain a number? *#* *[[:digit:]]* *[digit]* [0-9]

*[[:digit:]]*

Which pattern will match only filenames ending with "b"? b* *b *b* [!b]*

*b

Which pattern will match all filenames containing a "b"? b* *b *b* [!b]*

*b*

Which item or file represents the location of the local group information? home directory /etc/passwd /etc/GID /etc/group

/etc/group

Which item or file represents the location of the local user account information? home directory /etc/passwd /etc/UID /etc/group

/etc/passwd

Which directory is the administrative superuser's home directory? /etc / /home/root /root

/root

Which directory contains non-persistent process runtime data? /tmp /etc /run /var

/run

Which directory contains regular commands and utilities? /commands /run /usr/bin /usr/sbin

/usr/bin

Which of the following represents stderr at the command line when used for redirection? 0 1 3 2

2

Which answer saves output to a file and discards error messages? &>file | tee file 2> /dev/null > file 1> /dev/null > file 2> /dev/null

> file 2> /dev/null

Which pattern will match only filenames at least three characters in length? ???* ??? \3* +++* ...*

???*

Which Bash shortcut or command jumps to the beginning of the command line? !number !string Pressing Ctrl+LeftArrow Pressing Ctrl+K Pressing Ctrl+A

Pressing Ctrl+A

Which Bash shortcut or command is used to clear characters from the cursor to the end of the command line? Pressing Ctrl+LeftArrow Pressing Ctrl+K Pressing Ctrl+A ; Pressing Esc+.

Pressing Ctrl+K

Which Bash shortcut or command jumps to the beginning of the previous word on the command line? Pressing Ctrl+LeftArrow Pressing Ctrl+K Pressing Ctrl+A !string !number

Pressing Ctrl+LeftArrow

Which Bash shortcut or command copies the last argument of previous commands? Selected Answer: Pressing Esc+. Answers: Pressing Ctrl+K Pressing Ctrl+A !number Pressing Esc+.

Pressing Esc+.

What directory under / contains the log files and spools for a Linux system? a. /boot b. /var c. /usr d. /opt

b. /var

Levi wants to run 5 commands sequentially, but does not want to create a shell script. He knows that each command is going to take approximately 20 minutes to run individually. However, he would like to go to lunch 15 minutes from now. He knows that he can type all of the commands on the same line and separate them with a certain character to run them sequentially. Which character can he type after each command to have them run one after the next without requiring further input from him? a. a comma b. a pound sign c. a semicolon d. a colon

c. semicolon

Which command will always return you to the working directory used prior to the current working directory? cd - cd -p cd ~ cd ..

cd -

Which command will always change the working directory to the parent of the current location? cd ~ cd .. cd ../.. cd -u1

cd ..

Which command will always change the working directory up two levels from the current location? cd ~ cd ../ cd ../.. cd -u2

cd ../..

Which command lists files in the current location, using a long format, and including hidden files? llong ~ ls -a ls -l ls -al

ls -al

Command to access the interface to the system reference manuals (i.e., show the manual pages)

man

To display a list of keyword-matching man page topics with section numbers, a keyword search of man pages is performed with which option? man -s keyword man -l keyword man -k keyword man -f keyword

man -k keyword

Manual pages are shipped as part of the software packages for which they provide documentation, and the pages can be accessed from the command line by using the man command. true or false

true

One source of documentation that is generally available on the local system are system manual pages or man pages. true or false

true.

Which term describes one of multiple logical consoles that can each support an independent login session? Physical Console Virtual Console Shell Terminal

virtual console

Which answer sends output to both the screen and a file at the same time? &>/dev/null >file 2>file2 | tee file | < file

| tee file