bzip2 and xz compression in Linux CLI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to compress a file using bzip2.

Linux CLI

bzip2 [1]

Drag options to blanks, or click blank then click option'

A-d

B-k

Cfile.txt

D-x

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-d' which is for decompression.

Using '-k' which keeps the original file but is optional.

Using '-x' which is not a valid bzip2 option.

The command 'bzip2 file.txt' compresses the file named file.txt using bzip2.

2fill in blank

medium

Complete the code to decompress a .bz2 file using bzip2.

Linux CLI

bzip2 [1] file.bz2

Drag options to blanks, or click blank then click option'

A-k

B-d

C-c

D-x

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-k' which keeps the original file but does not decompress.

Using '-c' which outputs to stdout but does not decompress by itself.

Using '-x' which is not a valid bzip2 option.

The '-d' option tells bzip2 to decompress the file.

3fill in blank

hard

Fix the error in the command to compress a file using xz.

Linux CLI

xz [1] file.txt

Drag options to blanks, or click blank then click option'

A-k

B-c

C-d

D-z

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-d' which decompresses instead of compressing.

Using '-z' which is not a valid xz option for compression (xz compresses by default).

Using '-c' which outputs to stdout but does not compress by itself.

The '-k' option tells xz to keep the original file after compression. The 'xz' command compresses by default without needing '-z'.

4fill in blank

hard

Fill both blanks to decompress a file and keep the original using xz.

Linux CLI

xz [1] [2] file.xz

Drag options to blanks, or click blank then click option'

A-d

B-k

C-c

D-z

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-z' which compresses instead of decompressing.

Using '-c' which outputs to stdout but does not keep the original file.

The '-d' option decompresses, and '-k' keeps the original file after decompression.

5fill in blank

hard

Fill all three blanks to create a compressed archive with xz and list its contents.

Linux CLI

tar [1] archive.tar.xz [2] | xz [3] > archive.tar.xz

Drag options to blanks, or click blank then click option'

A-cf

B-tf

C-z

D-xf

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-xf' which extracts instead of creating or listing.

Mixing up options for tar and xz commands.

Use '-cf' to create an archive, '-tf' to list contents, and '-z' to compress with xz.

Practice

1. What does the bzip2 command do in Linux?

easy

A. Deletes files permanently

B. Compresses files to make them smaller

C. Changes file permissions

D. Lists files in a directory

Solution

1. Step 1: Understand the purpose of bzip2

   The bzip2 command is used to compress files, reducing their size.

2. Step 2: Compare with other options

   Options B, C, and D describe unrelated file operations, not compression.

3. Final Answer:

   Compresses files to make them smaller -> Option B

4. Quick Check:

   bzip2 compresses files = A [OK]

Hint: bzip2 always compresses files to save space [OK]

Common Mistakes:

• Confusing compression with deletion
• Thinking bzip2 changes file permissions
• Assuming bzip2 lists files

2. Which command correctly compresses a file named data.txt using xz and keeps the original file?

easy

A. xz data.txt

B. xz -d data.txt

C. xz --delete data.txt

D. xz -k data.txt

Solution

1. Step 1: Identify the option to keep original files

   The -k option tells xz to keep the original file after compression.

2. Step 2: Check other options

   xz data.txt compresses but deletes original; B decompresses; D is invalid for keeping files.

3. Final Answer:

   xz -k data.txt -> Option D

4. Quick Check:

   Use -k to keep original = C [OK]

Hint: Use -k with xz to keep original file after compression [OK]

Common Mistakes:

• Forgetting -k deletes original file
• Using -d which decompresses instead
• Assuming --delete keeps original

3. What is the output of the command sequence?

echo "Hello" > file.txt
bzip2 -k file.txt
ls file.txt file.txt.bz2

medium

A. file.txt.bz2

B. file.txt

C. file.txt file.txt.bz2

D. No files listed

Solution

1. Step 1: Understand bzip2 -k effect

   The -k option keeps the original file file.txt and creates compressed file.txt.bz2.

2. Step 2: List files after compression

   Both file.txt and file.txt.bz2 exist, so ls shows both.

3. Final Answer:

   file.txt file.txt.bz2 -> Option C

4. Quick Check:

   -k keeps original and compressed files = B [OK]

Hint: bzip2 -k keeps original and compressed files both [OK]

Common Mistakes:

• Assuming original file is deleted
• Expecting only compressed file
• Thinking no files remain

4. You run xz -d file.xz but get an error saying "file.xz: No such file or directory". What is the likely problem?

medium

A. The file file.xz does not exist in the current directory

B. The -d option is invalid for decompression

C. You need to use -k to decompress

D. The file is already decompressed

Solution

1. Step 1: Understand the error message

   The error "No such file or directory" means the file file.xz is missing in the current folder.

2. Step 2: Check command options

   -d is correct for decompression; -k is unrelated to decompression; file must exist to decompress.

3. Final Answer:

   The file file.xz does not exist in the current directory -> Option A

4. Quick Check:

   File missing causes No such file error = A [OK]

Hint: Check file exists before decompressing with -d [OK]

Common Mistakes:

• Thinking -d is wrong option
• Using -k to decompress
• Ignoring file location

5. You have a large log file server.log. You want to compress it using bzip2 but keep the original file and later decompress it. Which sequence of commands is correct?

hard

A. bzip2 -k server.log
bzip2 -d server.log.bz2

B. bzip2 server.log
bzip2 -k -d server.log.bz2

C. bzip2 -d server.log
bzip2 -k server.log.bz2

D. bzip2 -k -d server.log
bzip2 server.log.bz2

Solution

1. Step 1: Compress with original kept

   Use bzip2 -k server.log to compress and keep the original file.

2. Step 2: Decompress the compressed file

   Use bzip2 -d server.log.bz2 to decompress back to original format.

3. Final Answer:

   bzip2 -k server.log bzip2 -d server.log.bz2 -> Option A

4. Quick Check:

   Use -k to keep original, -d to decompress = D [OK]

Hint: Compress with -k, decompress with -d for safe file handling [OK]

Common Mistakes:

• Using -d to compress
• Not keeping original file
• Mixing options order incorrectly