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rc/sh/isup

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#!/usr/bin/env sh
# YES_ZSH
# YES_BASH
# YES_DASH
# YES_ASH
isup() { ### @-
### return 0 if a given website returns a 2xx HTTP code.
###
### ```
### $ isup google.com && echo yay || echo nay
### yay
### $ isup fdhafdslkjgfjs.com && echo yay || echo nay
### nay
### ```
local c="$(curl -sLI -w '%{http_code}' -o /dev/null "$1")"
[ -z "${c#2[0-9][0-9]}" ]
}
[ -n "${preload+-}" ] || isup "$@"