Question: Please read the article about tr UNIX utility under the link below: http://www.thegeekstuff.com/2012/12/linux-tr-command/ Then describe what does tr do? Given a file test.txt, how to

Please read the article about tr UNIX utility under the link below: http://www.thegeekstuff.com/2012/12/linux-tr-command/ Then describe what does tr do? Given a file "test.txt", how to use tr to convert the lowercase a to e in the file into the corresponding capitals?

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