@Philippe,

The command rename 's/\b(\w)/\U$1/g' *.ext is is used to rename files with a specific extension in the current directory by modifying their names according to a regular expression pattern.

Let’s break down the components of the command:

• s/ – Indicates a substitution operation.
• \b – Represents a word boundary, ensuring that only the first character of each word is affected.
• (\w) – Captures a word character and stores it in a capturing group.
• \U$1 – Converts the captured character to uppercase.
• /g – Global flag, meaning it applies the substitution globally (to all occurrences).
• *.ext – Specifies the files to be renamed. In this case, it selects all files with the extension ".ext" in the current directory.

I wish you would have explained how that specific command works.

Thanks!

To change all txt extension to html extension:

$ rename txt html *.txt

But the files are still in the txt extension.

# rename 's/\.txt$/\.html/' *.txt

I have nearly 500 output files named from ‘xx00‘ to ‘xx 499‘, I want to change it for example to: ‘bb00‘ to ‘bb499‘.

Please I need your help

Sincerely
MRasheed