MCQs on Working with Files Programmatically | Shell Scripting

Master the art of Working with Files Programmatically in this set of 30 MCQs. Covering topics such as file descriptors, redirection, file reading and writing, file search, and archiving and compression.

MCQs on Working with Files Programmatically

File Descriptors and Redirection

1. What is a file descriptor in Linux?
   a) A unique identifier for an open file
   b) A type of file extension
   c) A command to read files
   d) A command used to create files
2. Which file descriptor is used for standard output (stdout)?
   a) 1
   b) 0
   c) 2
   d) 3
3. Which of the following is the correct syntax for redirecting output to a file?
   a) command > filename
   b) command >> filename
   c) command < filename
   d) Both a and b
4. How do you redirect both stdout and stderr to a file in Linux?
   a) command > file 2>&1
   b) command >> file 2>&1
   c) command 2>&1 > file
   d) command file > 2>&1
5. What does the 2> operator do in shell scripting?
   a) Redirects standard error (stderr) to a file
   b) Redirects standard output (stdout) to a file
   c) Appends output to a file
   d) Redirects both stdout and stderr to a file
6. In the context of file redirection, what does >& represent?
   a) Redirects standard output to standard error
   b) Combines both stdout and stderr into one stream
   c) Redirects both stdout and stderr to a file
   d) Changes the file descriptor of the output
7. Which of the following commands will append output to an existing file?
   a) command >> filename
   b) command > filename
   c) command << filename
   d) command <<< filename
8. How do you redirect the output of a command to both a file and the terminal simultaneously?
   a) command | tee filename
   b) command > filename | tee
   c) command 2>&1 | tee filename
   d) command >> filename | tee
9. What is the purpose of stdin in file handling?
   a) To accept input from the user or file
   b) To redirect output to a file
   c) To send output to the terminal
   d) To redirect both output and error
10. Which file descriptor is used for standard input (stdin)?
    a) 0
    b) 1
    c) 2
    d) 3

Reading and Writing to Files

11. Which of the following commands will display the contents of a file?
    a) cat filename
    b) ls filename
    c) touch filename
    d) echo filename
12. How can you read the contents of a file line by line in shell scripting?
    a) while read line; do echo $line; done < filename
    b) cat filename
    c) tail filename
    d) head filename
13. What command is used to write the output of a command to a file in Linux?
    a) echo > filename
    b) echo “text” > filename
    c) cat filename > output
    d) None of the above
14. Which command allows you to append content to a file in Linux?
    a) echo “text” >> filename
    b) echo “text” > filename
    c) write filename
    d) cat >> filename
15. How do you read a file into a variable in a shell script?
    a) variable=$(<filename)
    b) variable=cat filename
    c) variable=read filename
    d) variable=echo filename
16. How can you output the content of a file without displaying extra newlines?
    a) cat -n filename
    b) cat -A filename
    c) cat filename
    d) cat -s filename
17. What command can be used to edit a file interactively in the terminal?
    a) nano filename
    b) vim filename
    c) vi filename
    d) All of the above
18. Which command would you use to overwrite the contents of a file?
    a) echo “New text” > filename
    b) echo “New text” >> filename
    c) cat > filename
    d) cat >> filename
19. What does the tee command do in Linux?
    a) Reads from standard input and writes to both standard output and a file
    b) Reads from a file and writes to standard output
    c) Deletes a file
    d) Appends to a file without modifying the original
20. How can you read the first 10 lines of a file?
    a) head -n 10 filename
    b) tail -n 10 filename
    c) cat -n filename
    d) head filename

Finding Files with find and locate

21. Which command can be used to find files in a directory recursively?
    a) locate filename
    b) find filename
    c) grep filename
    d) ls filename
22. What is the find command syntax to search for files by name?
    a) find /path -name filename
    b) find /path filename
    c) find filename
    d) locate filename
23. How would you use find to search for files modified in the last 7 days?
    a) find /path -mtime -7
    b) find /path -atime -7
    c) find /path -ctime -7
    d) find /path -newermt 7
24. What does the locate command do?
    a) Searches for files based on a pre-built database
    b) Searches for files in the current directory
    c) Finds files based on file contents
    d) Lists files in a specified directory
25. How do you search for a file by its type using the find command?
    a) find /path -type f
    b) find /path -type d
    c) find /path -name filename -type f
    d) Both a and c
26. How do you find all files in a directory modified in the last 24 hours?
    a) find /path -mtime -1
    b) find /path -newermt 24h
    c) locate /path
    d) find /path -mtime +1
27. Which find option allows you to find files with specific permissions?
    a) -perm
    b) -exec
    c) -name
    d) -size
28. Which command can you use to locate files in Linux if the database is up-to-date?
    a) locate filename
    b) find filename
    c) ls filename
    d) search filename
29. What does the -exec option do with the find command?
    a) Executes a command on the found files
    b) Prints the name of the files
    c) Modifies the contents of the files
    d) Deletes the files
30. Which command can you use to find empty files in a directory?
    a) find /path -empty
    b) find /path -size 0
    c) find /path -type f -empty
    d) Both a and b

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