CSCE 3600 MIDTERM EXAM
QUESTIONS AND ANSWERS 100%
CORRECT
The directory is a type of file - ANSWER-True
_________ Linux command is used to count the total number of lines, words, and
characters contained in a file. - ANSWER-wc
Which Linux command is used to go back from a directory to the directory before that? -
ANSWER-cd ..
How many types of basic permissions are available in Linux to grant a user? -
ANSWER-3
In a multiuser multitasking Linux operating system, what does "multitasking" refer to? -
ANSWER-The capability of the operating system to run multiple programs concurrently
on a single processor.
You need to list all files and directories in the current directory, including hidden ones.
Which linux command would you use? - ANSWER-ls -a
You need to copy a file named "report.txt" to a directory named "backup". How would
you do that? Choose the right command. - ANSWER-cp report.txt backup
What is the output shown for a type echo command? - ANSWER-echo is a shell built-in
After issuing the command chmod go+rx apple.c, which of the following file permissions
is possible for the ordinary file apple.c?
Hint: g stands for group and o stands for others - ANSWER--rwxr-xr-x
In a system call, the user has super-privileges whereas the kernel has no privilege. -
ANSWER-False
When a process running in user mode makes a system call to open() to access a file,
what accurately represents the role of kernel and user mode, - ANSWER-The open()
system call switches the process to kernel mode, which accesses the file on behalf of
the process
_____________ primarily provides a text-based interface through which users can
execute commands, manage files, and perform various system tasks in the Linux OS. It
, allows users to control and manage the system using text-based commands and
scripting. - ANSWER-shell
You have a log file and want to find all lines that start with the word "ERROR" followed
by a colon. Which grep command would you use? - ANSWER-grep "^ERROR:"
logfile.txt
You want to count the number of lines in a file that do not contain the word "error."
Which grep command would you use? - ANSWER-grep -c -v "error" file.txt
How can you make sed edit a file in place (i.e., modify the file directly)? - ANSWER--i
What is the purpose of the -n option in sed? - ANSWER-Suppresses automatic printing
of pattern space.
How can you specify a range of lines to apply a sed command to? - ANSWER-Using
line numbers separated by a comma (e.g., 1,3).
Device drivers in an operating system are responsible only for providing hardware-
specific functionalities and have no role in managing the communication between
software applications and hardware devices. - ANSWER-False
What is a fundamental difference between the C standard library functions and system
calls in a Unix-like operating system? - ANSWER-C standard library functions execute
in user mode, while system calls transition to kernel mode to access privileged
operations.
What does cd .. command do ? - ANSWER-Directory switched to the previous level
Which sed command is used to read and insert the contents of a file at the current
position in the output? - ANSWER-r
Which regex metacharacter is used to specify the end of a line? - ANSWER-$
What does the regex (abc|def) match? - ANSWER-Either "abc" or "def".
Which regex quantifier is used to match one or more occurrences of the preceding
element? - ANSWER-'+'
In regex, the . (dot) character typically represents _______________ - ANSWER-Any
single character except a newline.
(True / False) The command below replaces the 5th line of a file with a new line of text
sed '5s/.*/This is a new line/' input.txt > output.txt - ANSWER-True
QUESTIONS AND ANSWERS 100%
CORRECT
The directory is a type of file - ANSWER-True
_________ Linux command is used to count the total number of lines, words, and
characters contained in a file. - ANSWER-wc
Which Linux command is used to go back from a directory to the directory before that? -
ANSWER-cd ..
How many types of basic permissions are available in Linux to grant a user? -
ANSWER-3
In a multiuser multitasking Linux operating system, what does "multitasking" refer to? -
ANSWER-The capability of the operating system to run multiple programs concurrently
on a single processor.
You need to list all files and directories in the current directory, including hidden ones.
Which linux command would you use? - ANSWER-ls -a
You need to copy a file named "report.txt" to a directory named "backup". How would
you do that? Choose the right command. - ANSWER-cp report.txt backup
What is the output shown for a type echo command? - ANSWER-echo is a shell built-in
After issuing the command chmod go+rx apple.c, which of the following file permissions
is possible for the ordinary file apple.c?
Hint: g stands for group and o stands for others - ANSWER--rwxr-xr-x
In a system call, the user has super-privileges whereas the kernel has no privilege. -
ANSWER-False
When a process running in user mode makes a system call to open() to access a file,
what accurately represents the role of kernel and user mode, - ANSWER-The open()
system call switches the process to kernel mode, which accesses the file on behalf of
the process
_____________ primarily provides a text-based interface through which users can
execute commands, manage files, and perform various system tasks in the Linux OS. It
, allows users to control and manage the system using text-based commands and
scripting. - ANSWER-shell
You have a log file and want to find all lines that start with the word "ERROR" followed
by a colon. Which grep command would you use? - ANSWER-grep "^ERROR:"
logfile.txt
You want to count the number of lines in a file that do not contain the word "error."
Which grep command would you use? - ANSWER-grep -c -v "error" file.txt
How can you make sed edit a file in place (i.e., modify the file directly)? - ANSWER--i
What is the purpose of the -n option in sed? - ANSWER-Suppresses automatic printing
of pattern space.
How can you specify a range of lines to apply a sed command to? - ANSWER-Using
line numbers separated by a comma (e.g., 1,3).
Device drivers in an operating system are responsible only for providing hardware-
specific functionalities and have no role in managing the communication between
software applications and hardware devices. - ANSWER-False
What is a fundamental difference between the C standard library functions and system
calls in a Unix-like operating system? - ANSWER-C standard library functions execute
in user mode, while system calls transition to kernel mode to access privileged
operations.
What does cd .. command do ? - ANSWER-Directory switched to the previous level
Which sed command is used to read and insert the contents of a file at the current
position in the output? - ANSWER-r
Which regex metacharacter is used to specify the end of a line? - ANSWER-$
What does the regex (abc|def) match? - ANSWER-Either "abc" or "def".
Which regex quantifier is used to match one or more occurrences of the preceding
element? - ANSWER-'+'
In regex, the . (dot) character typically represents _______________ - ANSWER-Any
single character except a newline.
(True / False) The command below replaces the 5th line of a file with a new line of text
sed '5s/.*/This is a new line/' input.txt > output.txt - ANSWER-True
