Question: ciphertext. You can use the tr command to do this. For example, in the following, we replace letters a , e , and t in

ciphertext. You can use the tr command to do this. For example, in the following, we replace
letters a, e, and t in in. txt with letters X, G, E, respectively; the results are saved in out.txt.
$ tr 'aet' 'XGE' < in.txt > out.txt

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