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rc/sh/days

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#!/usr/bin/env sh
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# YES_ZSH
# YES_BASH
# YES_DASH
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days() {
[ $# -le 1 ] || { printf "%s\n" "$0: too many arguments" >&2; return 1; }
echo $(( ($(date +%s) - $(date -d "$1" +%s)) / 60 / 60 / 24 ))
}
[ "${SOURCING:-0}" -gt 0 ] || days "$@"