bzip2 and xz compression in Linux CLI - Step-by-Step Execution

Concept Flow - bzip2 and xz compression

Start with file

↓

Choose compression tool

↓

bzip2

↓

Compress file

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Create .bz2

↓

File size smaller

↓

Decompress when needed

↓

Original file restored

This flow shows how you start with a file, pick bzip2 or xz to compress it, get a smaller file, and later decompress it back.

Execution Sample

Linux CLI

bzip2 example.txt
ls example.txt.bz2
bzip2 -d example.txt.bz2
xz example.txt
ls example.txt.xz

Compress 'example.txt' with bzip2 and xz, then list the compressed files.

Execution Table

Step	Command	Action	Output	File State
1	bzip2 example.txt	Compress example.txt using bzip2	No output if success	example.txt.bz2 created, example.txt removed
2	ls example.txt.bz2	List compressed file	example.txt.bz2	example.txt.bz2 exists
3	bzip2 -d example.txt.bz2	Decompress bzip2 file	No output if success	example.txt restored, example.txt.bz2 removed
4	xz example.txt	Compress example.txt using xz	No output if success	example.txt.xz created, example.txt removed
5	ls example.txt.xz	List compressed file	example.txt.xz	example.txt.xz exists
6	xz -d example.txt.xz	Decompress xz file	No output if success	example.txt restored, example.txt.xz removed
7	ls example.txt	List original file	example.txt	example.txt exists, no compressed files
8	ls example.txt.bz2 example.txt.xz	Check compressed files	ls: cannot access 'example.txt.bz2': No such file or directory ls: cannot access 'example.txt.xz': No such file or directory	No compressed files exist

💡 Compression commands remove original file and create compressed file; decompression restores original and removes compressed file.

Variable Tracker

File	Start	After bzip2 compress	After bzip2 decompress	After xz compress	After xz decompress
example.txt	exists	removed	restored	removed	restored
example.txt.bz2	not exist	created	removed	not exist	not exist
example.txt.xz	not exist	not exist	not exist	created	removed

Key Moments - 3 Insights

Why does the original file disappear after compression?

Because both bzip2 and xz by default delete the original file after creating the compressed version, as shown in execution_table steps 1 and 4.

How do I get my original file back after compression?

Use the decompression commands 'bzip2 -d' or 'xz -d' which restore the original file and remove the compressed file, as seen in steps 3 and 6.

Can I keep the original file after compression?

Yes, by adding the '-k' option (e.g., 'bzip2 -k example.txt'), the original file stays, but this is not shown in the current execution_table.

Visual Quiz - 3 Questions

Look at the execution_table, what is the file state after step 1?

A example.txt and example.txt.bz2 both exist

B example.txt exists, example.txt.bz2 removed

C example.txt removed, example.txt.bz2 created

D No files exist

💡 Hint

Check the 'File State' column in row for step 1.

At which step does the original file get restored after bzip2 compression?

A Step 3

B Step 5

C Step 6

D Step 2

💡 Hint

Look for decompression of bzip2 in the 'Command' column.

If you add '-k' option to bzip2, how would the file state after compression change?

A Original file removed, compressed file created

B Original file kept, compressed file created

C Only original file exists, no compressed file

D Both files removed

💡 Hint

Recall the key moment about keeping original files with '-k' option.

Concept Snapshot

bzip2 and xz compress files to save space.
Use 'bzip2 filename' or 'xz filename' to compress.
Original file is removed by default.
Use '-d' option to decompress and restore original.
Add '-k' to keep original file after compression.

Full Transcript

This lesson shows how to compress files using bzip2 and xz commands in Linux. When you run 'bzip2 example.txt', it compresses the file and removes the original, creating 'example.txt.bz2'. Similarly, 'xz example.txt' creates 'example.txt.xz' and removes the original. To get the original file back, use 'bzip2 -d example.txt.bz2' or 'xz -d example.txt.xz'. By default, compression deletes the original file, but you can keep it by adding the '-k' option. The execution table traces these steps and file states clearly.