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#!/usr/bin/env sh
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[ "$#" -lt 1 ] && { echo "No arguments provided" >&2 ; exit 1; }
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[ "$#" -gt 1 ] && { echo "Too many arguments provided" >&2 ; exit 2; }
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# shellcheck disable=SC1090
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{ [ -f "$1" ] && . "$1"; } || { echo "$1 does not exist" >&2 ; exit 3; }
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