rot13 by llhuii(nn)

M=toupper(m="nopqrstuvwxyzabcdefghijklm@@@@@@")m{for($(OFS=FS=o=n=_)=$0;$++n;i&&$n=sprintf("%c",i+64))i=index(M,$n)}1

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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