例如，出纳员将产品的价格输入终端机和后台系统的方法就是一种由于条形码和扫描仪的发明而带来的新方法。

For example, the way cashiers entered the price of products into the terminal and logistics systems changed drastically with the invention of bar codes and scanners.

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类似地，后台任务希望收到来自控制终端的输入，但是控制终端不能将您输入的任何字符定向到后台进程的 stdin。

Similarly, the background task expects input from the controlling terminal, but the controlling terminal has no way of directing any characters you type to the stdin of a background process.

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当使用默认的 bash 终端设置在后台运行作业时，bash 通常会捕获 SIGCHLD 信号并在打印下一个终端输出行之后 打印消息。

When you run a job in the background with default bash terminal settings, bash normally catches SIGCHLD signals and prints a message after the next terminal output line is printed.

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