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 UWA week 11 (1st semester, week 3) ↓
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tr -c  (both)
12:30pm Fri 18th Mar, Daniel S.

'[A-Za-z]' will match any upper or lower case character. If you understand tr -c then you will know what characters we are trying to replace. \0 indicates that we are typing an octal value. In this case, we are putting in octal value 12. To know what character that is, you will need to look up an ascii table

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