Tip
所有的错误信息都应该被导向STDERR。
这使得从实际问题中分离出正常状态变得更容易。
推荐使用类似如下函数，将错误信息和其他状态信息一起打印出来。
err() {
echo "[$(date +'%Y-%m-%dT%H:%M:%S%z')]: $@" >&2
}
if ! do_something; then
err "Unable to do_something"
exit "${E_DID_NOTHING}"
fi
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