cp — Linux basic command

A command that copies files or directories.

Basic Information

What is this command?

cp is an abbreviation for copy, a command that copies files or directories. The original remains, and a copy is created.

It provides various options from single file copying to recursive directory copying, preserving attributes, preventing overwriting, etc.

What problems does it solve?

• Backs up files.
• Duplicates and modifies configuration files.
• Copies an entire directory to another location.
• Copies files safely without overwriting.

Main Features

Single File Copy

Copies a file to a different name or location.

• Usage Scenario: When file backup or duplication is needed.
• Result Obtained: A copy identical to the original is created.
• Limitations: If a file with the same name exists in the destination, it will be overwritten.

Recursive Directory Copy (-r)

Copies the directory and all its sub-items together.

• Usage Scenario: When cloning an entire project folder.
• Result Obtained: The subdirectory and file structure is copied as-is.
• Limitations: Copying a directory without -r will cause an error.

Preserving Attributes (-p)

Preserves attributes such as permissions, owner, and modification time.

• Usage Scenario: When attributes need to be preserved in distribution scripts.
• Result Obtained: The copy has the same attributes as the original.
• Limitations: Changing the owner requires root privileges.

Preventing Overwriting (-n)

Skips if a file with the same name exists in the destination.

• Usage Scenario: When you want to avoid accidentally overwriting important files.
• Result Obtained: Existing files are protected.
• Limitations: Skipped files have no notification, so manual checking is required.

Installation and Execution

Check Default Installation

It is included by default in all Linux distributions.

which cp
cp --version

Separate Installation (Lightweight Environments)

It is usually already installed.

sudo apt install coreutils   # Debian/Ubuntu
sudo dnf install coreutils     # Fedora

Actual Usage Examples

Basic File Copy

Copies a file.

# Copy file
cp report.txt report-backup.txt

# Copy to another directory
cp report.txt /var/backups/

# Copy multiple files at once
cp file1.txt file2.txt /tmp/

Recursive Directory Copy

Copies an entire directory.

# Copy entire directory (-r option required)
cp -r project/ project-backup/

# Copy while preserving attributes
cp -rp /etc/nginx/ /tmp/nginx-backup/

Safe Copy (Preventing Overwriting)

Copies while protecting existing files.

# Skip if file with same name exists
cp -n config.txt /etc/app/

# Add backup timestamp
cp config.txt config.txt.$(date +%Y%m%d).bak

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