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1. Open the terminal or command prompt.
2. Navigate to the parent directory that contains the directory "a" and "b".
3. Use the following command to move files from directory "a/b" to directory "a":

mv a/b/* a/

1. Use the following command to remove directory "b":

rm -r a/b/

Note: Be careful while using the "rm" command as it can permanently delete files and directories. Make sure you have a backup of the files if needed.