You use this command whenever you have to remove a filter rule providing its rule id.
您可以使用此命令在任何时候根据规则ID来删除过滤规则。
Command line logging filter checks.
命令行日志过滤器检查。
Since tr is purely a filter, you generate input for it using the cat command.
由于tr是纯粹的过滤器，因此您将使用cat命令为其生成输入。
You could open up an app like Synaptic and set a filter to show everything marked as "installed", or you could do it quickly and easily from the command line with DPKG.
你可以打开一个像Synaptic的程序并设置一个过滤来显示所有标记为“已安装”的程序，或者你也可以通过命令行用dpkg快速简单地完成这一工作。
If you do have a filter that requires input from stdin, you might think of using the cat command to copy the file to stdout, which would work.
如果您有要求来自stdin的输出的过滤器，那么可以考虑使用cat命令将文件复制到 stdout。
Mkfilt: This is a key command that allows us to activate or deactivate the filter rules in the table, enable or disable logging for filters, and change the default rules.
mkfilt：这是一个重要的命令，它可以激活或停用表中的过滤规则，启用或禁用过滤日志，并改变默认规则。
Using the grep command, you can filter the result and retrieve just the parameters you want.
通过使用grep命令，可以过滤结果，只获取想要的参数。
The pgrep command provides options to filter processes by user name (the -u shown), process group, group, and more.
pgrep命令提供筛选选项，允许按用户名（上面给出的 -u）、进程组、组等筛选进程。
Use the xargs tool as a filter for making good use of output culled from the find command.
使用xargs工具作为筛选器，以充分利用从find命令挑选的输出。
The output from this is huge, even on a lightly loaded system, so you typically either supply the name of a directory as a command-line argument or use a pipe to filter its output.
即使在负载很轻的系统上，这个命令的输出也非常长，因此通常通过命令行参数指定一个目录名，或者使用管道筛选它的输出。
Our final sed example uses the = command to print line numbers and then filter the resulting output through sed again to mimic the effect of the nl command to number lines.
最后一个sed示例使用 =命令输出行号，然后再次使用 sed过滤生成的输出，以模拟使用nl 命令对行进行编号的效果。
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。
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。
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