如何vmstat的输出重定向到Android操作系统中的文件? [英] how to redirect the vmstat's output to a file in Android OS?
问题描述
我连接到我的手机扎根通过亚行的shell命令,我跑
在的vmstat 命令,以便观看各种系统资源。是
有没有办法vmstat的输出重定向到一个文件。我想:
I connect to my rooted phone through adb shell command and I run the vmstat command so as to watch various system resources. Is there a way to redirect vmstat's output to a file. I tried:
vmstat > /sdcard/vmstat_output.txt
但它不工作..它创建该文件,但里面有没有数据。
but it doesn't work.. It creates the file but there is no data inside..
任何想法?
推荐答案
好吧,我解决了这一问题。我从<一个下载源代码href=\"http://$c$c.google.com/p/android/issues/attachmentText?id=17996&aid=179960000000&name=vmstat.c&token=795cfaef27ae3d19ba2784afdf94a61f\"相对=nofollow>这里,我增加了一个额外的行:
Ok, I fixed the problem. I download the source from here and I added one extra line:
fflush(stdout);
在print_line命令(行:134)之后。然后,我交叉编译的vmstat.c
海湾合作委员会:
agcc vmstat.c -o vmstat
和把文件复制到/ SD卡/通过亚行:
and put the file to the /sdcard/ through the adb:
adb push vmstat /sdcard/
现在重定向作品
完美,因为每个print_line呼叫后,将数据刷新到该文件。正如马克Polhamus提到,
问题是以下事实的vmstat是块缓冲命令,这意味着一个缓冲
已被第一填充有数据,然后这个数据将被刷新到文件..
Now the redirection works perfectly, as after every print_line call, the data are flushed to the file. As Mark Polhamus mentioned, the problem was the fact that vmstat is a block-buffered command, which means that a buffer has to be filled with data first and then this data will be flushed to the file..
非常感谢马克! :)
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