如何从 wget 输出 grep 下载速度? [英] How to grep download speed from wget output?

问题描述

我需要使用 wget 下载多个文件并测量下载速度.

I need to download several files with wget and measure download speed.

例如我用

wget -O /dev/null http://ftp.bit.nl/pub/OpenBSD/4.7/i386/floppy47.fs http://ftp.bit.nl/pub/OpenBSD/4.7/i386/floppyB47.fs

输出是

--2010-10-11 18:56:00--  http://ftp.bit.nl/pub/OpenBSD/4.7/i386/floppy47.fs
Resolving ftp.bit.nl... 213.136.12.213, 2001:7b8:3:37:20e:cff:fe4d:69ac
Connecting to ftp.bit.nl|213.136.12.213|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 1474560 (1.4M) [text/plain]
Saving to: `/dev/null'

100%[==============================================================>] 1,474,560    481K/s   in 3.0s

2010-10-11 18:56:03 (481 KB/s) - `/dev/null' saved [1474560/1474560]

--2010-10-11 18:56:03--  http://ftp.bit.nl/pub/OpenBSD/4.7/i386/floppyB47.fs
Reusing existing connection to ftp.bit.nl:80.
HTTP request sent, awaiting response... 200 OK
Length: 1474560 (1.4M) [text/plain]
Saving to: `/dev/null'

100%[==============================================================>] 1,474,560    499K/s   in 2.9s

2010-10-11 18:56:06 (499 KB/s) - `/dev/null' saved [1474560/1474560]

FINISHED --2010-10-11 18:56:06--
Downloaded: 2 files, 2.8M in 5.9s (490 KB/s)

我需要grep总下载速度，也就是字符串490 KB/s.我该怎么做?

I need to grep the total download speed, that is, the string 490 KB/s. How do I do this?

附言可能需要考虑到我们实际上只会下载一个文件的情况，所以不会有以 FINISHED

P.S. May need to account for the case that we will actually download only one file, so there won't be final output starting with FINISHED

推荐答案

更新，使用 sed 的 grep 样式版本:

Update, a grep-style version using sed:

wget ... 2>&1 | sed -n '$,$s/.*((.*)).*/1/p'

旧版本:

我认为，下载后将文件大小除以下载时间更容易.;-)

I thought, it's easier to divide the file size by the download time after the download. ;-)

(/usr/bin/time -p wget ... 2>&1 >/dev/null; ls -l newfile) | 
awk '
   NR==1 {t=$2};
   NR==4 {printf("rate=%f bytes/second
", $5/t)}
'

awk 的第一行在变量 t 中存储了real xx.xx"经过的实时时间.第二行 awk 将文件大小(ls -l 的第 5 列)除以时间并将其作为速率输出.

The first awk line stores the elapsed real time of "real xx.xx" in variabe t. The second awk line divides the file size (column 5 of ls -l) by the time and outputs this as the rate.

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