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The 'tr' command can be used to quickly convert uppercase to lowercase and vice versa. This is done with:

tr [:upper:] [:lower:]

To give an example this can be used to rename all files in the current directory to lowercase (there are other ways to do this, but this is a decent example):

for file in * ; do echo mv "$file" "`echo $file | tr [:upper:] [:lower:]`"; done

Of course you can convert the other way by swapping '[:upper:]' and '[:lower:]'.

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