Error about the tr command of linux shell -

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when type command :

$ echo 1234567890 | tr '9-0' '9876'

it says "tr: range-endpoints of '9-0' in reverse collating sequence order". mean? means can type "0-9"?

yes, that's means. '9-0' isn't range, anymore 'z-a' range. otherwise, how know whether mean 0-9 or entire unicode range starting 9, going top of range , wrapping around 0?


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