将TOP命令的输出限制为特定的进程名称 [英] Limit the output of the TOP command to a specific process name

问题描述

如果调用top命令，您将获得所有正在运行的进程。但是我如何才能仅限限制某个进程的名称，例如java

If you call the top command, you get all the running processes. But how can I limit the output only to a certain process name like "java"?

试过这个
top -l 2 | grep java
，但这样您只能获取快照，而不是持续更新的列表。和 top -l 0 | grep java 不是很清楚。

I've tried this top -l 2 | grep java but in this way you get only snapshots and not a continuously updated list. And top -l 0 | grep java is not really clear.

推荐答案

我更喜欢以下所以我仍然可以使用交互式顶部，每次我运行它查找pids：

I prefer the following so I can still use top interactively without having to look up the pids each time I run it:

top -p `pgrep process-name | tr "\\n" "," | sed 's/,$//'`

当然，如果进程改变，重新运行命令。

Of course if the processes change you'll have to re-run the command.

说明：

• pgrep process-name 返回由换行符分隔的进程ID列表


• tr\\\\
将这些换行符转换为逗号，因为top想要一个以逗号分隔的进程ID列表


• sed 是流编辑器， sed's /，$ //'用于删除结尾的逗号

• pgrep process-name returns a list of process ids which are separated by newlines
• tr "\\n" "," translates these newlines into commas, because top wants a comma-separated list of process ids
• sed is a stream editor, and sed 's/,$//' is used here to remove the trailing comma

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