How to Rename a Directory in Linux With mv, rename, or find command

How to rename a directory in Linux using the mv, rename, and find commands, along with information on installing rename and regular expressions for changing directory names to lowercase or uppercase?

Renaming a Directory in Linux

Using mv Command:
mv old_directory_name new_directory_name

Using rename Command:
rename 's/old_directory_name/new_directory_name/' *

Using find Command:
find . -depth -name 'old_directory_name' -execdir mv {} new_directory_name \;

Installing rename in Linux

For Debian/Ubuntu:
sudo apt-get install rename

For RedHat/CentOS:
sudo yum install rename

Regular Expressions for Directory Name Changes

Change All Letters to Lowercase:
rename 'y/A-Z/a-z/' *

Change All Letters to Uppercase:
rename 'y/a-z/A-Z/' *

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