scp and rsync for file transfer in Linux CLI - Practice Problems & Coding Challenges

Challenge - 5 Problems

💻 Command Output

intermediate

What is the output of this rsync command?

You run this command to copy files from your local folder to a remote server:

rsync -avz /home/user/docs/ user@remote:/backup/docs/

What will rsync display as output?

Linux CLI

rsync -avz /home/user/docs/ user@remote:/backup/docs/

A A simple message: 'Transfer complete' without file details

B Only a progress bar with percentage and speed

C No output unless there is an error

D A list of files copied with details and a summary of transferred bytes

💡 Hint

The -v option in rsync means verbose output.

The -a option means archive mode (preserves permissions, timestamps), -v means verbose (shows files copied), and -z compresses data. So rsync lists files copied with details and a summary.

💻 Command Output

intermediate

What error does this scp command produce?

You run this command to copy a file from a remote server to your local machine:

scp user@remote:/path/to/file.txt /local/path/

But the remote path is incorrect. What error message will scp show?

Linux CLI

scp user@remote:/path/to/file.txt /local/path/

A scp: /path/to/file.txt: No such file or directory

B Permission denied (publickey).

C Connection timed out during banner exchange

D scp: /local/path/: Not a directory

💡 Hint

Check if the remote file path exists.

If the remote file path does not exist, scp reports 'No such file or directory'. Other errors relate to authentication or local path issues.

📝 Syntax

advanced

Which rsync command correctly excludes all .log files during transfer?

You want to copy a folder but skip all files ending with .log. Which command does this correctly?

A rsync -av --exclude '*.log' /source /dest

B rsync -av --exclude '*.log' /source/ /dest/

C rsync -av --exclude='*.log' /source/ /dest/

D rsync -av --exclude=*.log /source/ /dest/

💡 Hint

The exclude pattern should be quoted to avoid shell expansion.

Option C correctly quotes the pattern with single quotes and includes trailing slashes on source and destination for proper directory sync.

💻 Command Output

advanced

What is the output of this scp command copying a directory?

You run:

scp -r /local/folder user@remote:/remote/folder

What output will scp produce?

Linux CLI

scp -r /local/folder user@remote:/remote/folder

A Syntax error: -r option not supported

B Copies all files and subfolders recursively, showing each file copied

C Copies only the folder without contents, no output

D Copies files but skips hidden files silently

💡 Hint

The -r option means recursive copy.

scp -r copies directories recursively and shows each file copied by default.

🚀 Application

expert

Which rsync command synchronizes two folders and deletes files in destination missing from source?

You want to make /backup an exact copy of /data, removing any files in /backup that are not in /data. Which command does this?

A rsync -av --delete /data/ /backup/

B rsync -av /data/ /backup/

C rsync -av --remove-source-files /data/ /backup/

D rsync -av --delete-after /backup/ /data/

💡 Hint

The --delete option removes extra files in destination.

Option A uses --delete to remove files in /backup not in /data, syncing exactly. Option A does not delete. Option A moves files. Option A reverses source and destination.

Practice

1. What is the primary difference between scp and rsync when transferring files?

easy

A. scp requires no authentication, rsync always does.

B. scp is used only for local copies, rsync only for remote.

C. scp compresses files automatically, rsync does not.

D. scp copies files directly, while rsync syncs only changed parts.

Solution

1. Step 1: Understand scp behavior

   scp copies entire files securely from one machine to another without checking differences.

2. Step 2: Understand rsync behavior

   rsync compares source and destination and transfers only changed parts, making it efficient for syncing.

3. Final Answer:

   scp copies files directly, while rsync syncs only changed parts. -> Option D

4. Quick Check:

   Difference in transfer method = C [OK]

Hint: Remember: rsync syncs changes, scp copies whole files [OK]

Common Mistakes:

• Thinking scp syncs files like rsync
• Believing scp works only locally
• Assuming rsync doesn't need authentication

2. Which of the following is the correct syntax to copy a file named report.txt from your local machine to a remote server using scp?

easy

A. scp report.txt user@remote:/home/user/

B. scp user@remote:/home/user/ report.txt

C. scp -r report.txt user@remote:/home/user/

D. scp /home/user/report.txt user@remote:

Solution

1. Step 1: Identify source and destination in scp

   Syntax is scp source destination. Here, source is local file report.txt.

2. Step 2: Check destination format

   Destination must be remote user and path: user@remote:/home/user/. scp report.txt user@remote:/home/user/ matches this.

3. Final Answer:

   scp report.txt user@remote:/home/user/ -> Option A

4. Quick Check:

   Local to remote copy syntax = A [OK]

Hint: Remember: scp source destination, remote uses user@host:path [OK]

Common Mistakes:

• Reversing source and destination
• Using -r for single file copy
• Omitting user@host in remote path

3. What will be the output of this command if the directory backup/ exists on both local and remote, but only one file data.txt changed locally?
rsync -avz backup/ user@remote:/home/user/backup/

medium

A. Only the changed data.txt file will be transferred to remote.

B. All files in backup/ will be transferred again.

C. The command will fail due to missing -r option.

D. The remote directory will be deleted and replaced.

Solution

1. Step 1: Understand rsync -avz flags

   -a is archive (recursive + preserve), -v verbose, -z compress during transfer.

2. Step 2: Behavior with existing directories

   rsync compares files and transfers only changed files, so only data.txt will be sent.

3. Final Answer:

   Only the changed data.txt file will be transferred to remote. -> Option A

4. Quick Check:

   rsync syncs changed files only = D [OK]

Hint: rsync with -a syncs only changed files, not all [OK]

Common Mistakes:

• Thinking rsync copies all files every time
• Believing -r is needed separately with -a
• Assuming remote directory is deleted

4. You run this command to copy a directory:
scp -r myfolder user@remote:/home/user/
But you get an error: scp: command not found. What is the most likely cause?

medium

A. You forgot to add the -v verbose flag.

B. The scp command is not installed on the local machine.

C. The remote path is incorrect and missing a trailing slash.

D. You need to use rsync instead of scp for directories.

Solution

1. Step 1: Analyze the error message

   scp: command not found means the local system cannot find the scp program.

2. Step 2: Check other options

   Verbose flag or remote path errors cause different errors; scp supports directories with -r.

3. Final Answer:

   The scp command is not installed on the local machine. -> Option B

4. Quick Check:

   Command not found means missing program = A [OK]

Hint: Command not found means program missing locally [OK]

Common Mistakes:

• Assuming -v fixes command not found
• Thinking remote path syntax causes this error
• Believing scp can't copy directories

5. You want to efficiently backup a large folder project/ from your local machine to a remote server daily. Which command best ensures only new or changed files transfer, compresses data, and preserves permissions?

hard

A. scp -r project/ user@remote:/backup/project/

B. scp project/* user@remote:/backup/project/

C. rsync -avz project/ user@remote:/backup/project/

D. rsync -r project/ user@remote:/backup/project/

Solution

1. Step 1: Identify requirements

   Need to transfer only new/changed files, compress data, and preserve permissions.

2. Step 2: Match command options

   rsync -avz means archive (preserves permissions, recursive), verbose, and compress during transfer, ideal for backups.

3. Step 3: Compare other options

   scp -r copies all files every time without compression; rsync -r lacks archive and compression flags.

4. Final Answer:

   rsync -avz project/ user@remote:/backup/project/ -> Option C

5. Quick Check:

   Efficient backup with compression and permissions = B [OK]

Hint: Use rsync -avz for efficient, compressed, permission-preserving backups [OK]

Common Mistakes:

• Using scp for large repeated backups
• Omitting -a flag in rsync losing permissions
• Not compressing data during transfer