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rc/sh/dated

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#!/usr/bin/env sh
# YES_ZSH
# YES_BASH
# YES_DASH
# YES_ASH
dated() {
local ts= u=0
[ "$1" != -u ] || { shift; u=1; }
if [ $# = 0 ]; then
# -u doesn't actually do anything here, but...
if [ $u = 1 ]; then date -u '+%s'; else date '+%s'; fi
fi
for ts; do
if [ $u = 1 ]; then date -u -d '@'"$ts"; else date -d '@'"$ts"; fi
done
}
[ -n "${preload+-}" ] || dated "$@"