Rename Files and Directories in Linux: mv, rename, loops

Renaming files and directories is a common but vital task in Linux system management. Whether it’s for organizing content, restructuring a project, or streamlining automated workflows, Linux offers robust command-line utilities to make the process straightforward.

This guide covers different methods for renaming files and directories using the mv and rename commands. It also demonstrates how to handle bulk renaming with shell loops and shares tips to prevent overwriting files or creating naming conflicts.

Prerequisites

• Access to a Linux environment as a non-root user with sudo privileges.

Available Commands for Renaming

Linux provides several command-line tools to rename files and directories. The most popular include:

• mv: Renames or moves files and directories.
• rename: Changes multiple filenames using Perl-compatible patterns.
• Bash loops: Enables automated bulk renaming with custom logic.

Renaming Files in Linux

Changing filenames can help maintain order, improve clarity, and keep naming consistent across a project.

Using the mv Command

Syntax

mv [OPTIONS] old_filename new_filename

• old_filename: Current file name.
• new_filename: Name you want to assign.
• -i: Prompt before overwriting.
• -n: Prevent overwriting.

Examples

Rename document.txt to report.txt:

$ mv document.txt report.txt

Check the result:

$ ls

Prompt before replacing a file:

$ mv -i existing.txt backup.txt

Block overwriting with -n:

$ mv -n existing.txt backup.txt

If the filename has spaces, use quotes:

$ mv "old file.txt" "new file.txt"

Using the rename Command

This example uses the Perl-based rename utility, common in Debian-based systems like Ubuntu. On other distributions (e.g., CentOS, Fedora), rename may refer to a different version with different syntax.

$ sudo apt install rename

Syntax

rename 's/old_pattern/new_pattern/' files_to_rename

• 's/old/new/': Perl-style substitution.
• files_to_rename: Files to rename.

Examples

Change all .txt files to .md:

$ rename 's/\.txt$/\.md/' *.txt

Convert all filenames to lowercase:

$ rename 'y/A-Z/a-z/' *

Preview changes before applying:

$ rename -n 's/\.txt$/.md/' *.txt

Or simulate with a loop:

$ for f in *.txt; do echo mv "$f" "${f%.txt}.md"; done

Using Bash Loops

Syntax

for f in *.txt; do mv -- "$f" "${f%.txt}.pdf"; done

Example

Batch rename .txt files to .pdf:

$ for f in *.txt; do mv -- "$f" "${f%.txt}.pdf"; done

Prevent overwriting:

$ for f in *.txt; do mv -n -- "$f" "${f%.txt}.pdf"; done

Renaming Directories in Linux

Using the mv Command

Syntax

mv [OPTIONS] old_directory new_directory

Example

Rename projects to work:

$ mv projects work

Overwrite with -T:

$ mv -T projects work

Using the rename Command

Syntax

rename 's/old/new/' */

Example

Replace “old” with “new” in directory names:

$ rename 's/old/new/' */

Bulk Renaming Directories with Loops

Syntax

for dir in */; do mv "$dir" "${dir%/}_backup"; done

Example

Add _backup to all directory names:

$ for dir in */; do mv "$dir" "${dir%/}_backup"; done

Preview changes with echo:

$ for dir in */; do echo mv "$dir" "${dir%/}_backup"; done

Conclusion

This guide demonstrated renaming files and directories in Linux using mv, rename, and Bash loops. By using these tools, you can keep file systems organized, avoid naming conflicts, and automate repetitive tasks. For further details, refer to the official mv and rename manual pages.