To add an underscore to a filename, simply rename the file by right-clicking on it, selecting “Rename,” and inserting the underscore where desired. This method works across various operating systems like Windows, macOS, and Linux, as underscores are commonly supported in filenames.

To add an underscore to a filename, follow these organized steps:

Using Graphical User Interface (GUI):
Windows: Right-click on the file, select “Rename,” and insert the underscore at your desired position. You can also press F2 to rename without right-clicking.
macOS: In Finder, select the file, press Enter, and add the underscore where needed.
Linux (GNOME/KDE): Right-click on the file, choose “Rename,” and insert the underscore as desired.
Using Command Line Interface (CLI):
Open a terminal.
Use the command mv oldfilename new_filename_with_underscore.
Example: mv examplefile example_file.
Considerations:
File Systems: Most modern systems (NTFS, HFS+, ext4) support underscores.
Edge Cases: Ensure filenames don’t contain reserved characters like spaces or special symbols.
Applications: Underscores are generally safe and compatible with most software.
Keyboard Shortcuts:
Windows: F2 to rename.
macOS: Enter or Return after selecting the file.
Testing:
Verify functionality by opening files in various applications.
Check for any dependencies on filename structures in legacy systems.

Examples:
– Rename “examplefile” to “example_file_name”.

By following these steps, you can efficiently add underscores to filenames across different operating systems and environments.