String2 contains an invalid character class

We are having following line in shell scripts which is giving error

 echo "\nEnter ` echo TAM | tr [:lower:] [:upper:] `'s password ... \c"

tr: String2 contains an invalid character class.

Any help ...

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echo "\nEnter ` echo TAM | tr '[:lower:] [:upper:]' `'s password ... \c"

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It's completely pointless having tr in that line as it isn't doing anything.  It's a long winded way of saying

echo "\nEnter  TAM's password ... \c"
basiranaAuthor Commented:
Thank you
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