Setting up a general filter or redirection won't work if you want to send the output of different commands to different users.

如果希望将不同命令的输出发送到不同的用户，设置通用筛选器或重定向的方法并不会起作用。

youdao

As with many of the text commands we have looked at so far, sed can work as a filter or take its input from a file.

如同我们目前已经了解的许多文本命令一样，seb可以充当一个过滤器，或者从文件中获取其输入。

youdao

In order to use the output of a command, command1, as input to a filter, command2, you connect the commands using the pipe operator (|).

要将命令command1的输出作为过滤器command2的输入，您需要使用管道操作符(|)连接两个命令。

youdao

In fact, Grossman agrees that the sites' vulnerabilities weren't Microsoft's fault as much as the result of sloppy Web coding on the part of the Web sites' own developers, who failed to filter user input for manipulative commands.

FORBES: Google-Hacking Goes To China