Introducing the Batch Utility for Windows - mem.cmd 想知道CHROME到底有多占内存么？

I use HPZ800 server at home, which is almost never turned off or restarted. And I see this today:

我家里用的是HPZ800的服务器，所以长年不关机不重启，今天我看了CHROME好吃内存：

And the Proceses Tab gives you rough idea how big memory is consumed by Chrome.exe

在 Processes 页，操作系统列出了每个程序的吃内存情况，我们可以看到CHROME很吃内存。

However, I'd like to have a command line/tool that prints the memory usage for a given application.

然而，我想着写一个小命令行工具，练练手。

Github:

@echo off
REM Calculate Total Memory Consumption for a Process

setlocal enabledelayedexpansion
set prog=%1

if [%1]==[] (
  echo Usage: %0 Process
  goto end
)
set sum=0
@for /F "tokens=5" %%i in ('tasklist ^| grep !prog!') do (
    set mem=%%i
    set mem=!mem:,=!
    set /a sum=sum+!mem!
)

echo Total Memory for !prog! is !sum! K
set /a sum=sum/1024
echo Total Memory for !prog! is !sum! MB
set /a sum=sum/1024
echo Total Memory for !prog! is !sum! GB

:end

The idea is to use for /f in windows command line shell that will split the lines by default delimiter space and with tokens=5 that will extract the memory usage for that process.

原理就是用 for /f 来对每一行的输出进行字符串分割，tokens=5 会只选择第五列，也就是内存用量。

And we can use !variable:,=! to remove the , from the numbers and use set /a do sum up the number strings. However, you need to setlocal enabledelayedexpansion to allow variables updated at runtime (instead of pre-interpreted)

我们需要用 !variable:,=! 来把数字中的逗号去掉，然后用 set /a 来进行数字叠加，最后面我们需要启用 setlocal enabledelayedexpansion 在WINDOWS批处理中开启变量支持 - 否则变量只会在批处理启动的时候替换一次。

However, at Linux, you wouldn't need this at all, because you can use wc, awk, cut etc existing tools to achieve the same task by piping these commands one by one i.e. Where there is a shell, there is a way!

在LINUX下我们就不需要这么麻烦了，因为已经有很多现成好用的工具，比如 wc, awk, cut 这些命令可以通过管道来完成同样的任务。

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Reposted to: https://helloacm.com/introducing-the-batch-utility-for-windows-mem-cmd/

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