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rc/sh/rot13

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#!/usr/bin/env sh
# YES_ZSH
# YES_BASH
# YES_DASH
# YES_ASH
# works with busybox tr.
rot13() { ### @-
### rot13 with numbers rotated as well.
###
### ```
### $ rot13 <<< abc123
### nop678
### ```
###
### **NOTE:** there also exists rot13(1) programs provided by
### the *bsdgames* and *hxtools* packages that i don't use.
tr -- A-Za-z0-9 N-ZA-Mn-za-m5-90-4
}
[ -n "${preload+-}" ] || rot13 "$@"