Created
April 27, 2022 06:03
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The ROT13 substitution cipher
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| #!/bin/sh | |
| # The ROT13 substitution cipher. | |
| [ "$#" -ne 1 ] && printf 'usage: rot13 string\n' && exit 1 | |
| printf '%s\n' "$1" | LC_ALL=C tr 'A-Za-z' 'N-ZA-Mn-za-m' |
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