String2 contains an invalid character class

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

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

Error
------
tr: String2 contains an invalid character class.

Any help ...


basiranaAsked:
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omarfaridCommented:
try

echo "\nEnter ` echo TAM | tr '[:lower:] [:upper:]' `'s password ... \c"
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TintinCommented:
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"
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basiranaAuthor Commented:
Thank you
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