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Average speed from curl

Posted on 2013-05-10
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Last Modified: 2013-05-10
Hi,

Using curl, I would like to extract the average speed field into a variable.
However, I can't find a way to both suppress the progress info AND show the final stats.
So I guess we're down to tailing the very last progress line (^M delim) and pulling out the field.

e.g.
curl -o /dev/null  http://download.thinkbroadband.com/1MB.zip

Gives
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 1024k  100 1024k    0     0   297k      0  0:00:03  0:00:03 --:--:--  304k

I need 297k extracted.

Any help would be appreciated.

BT
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Question by:brothertom
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4 Comments
 
LVL 68

Expert Comment

by:woolmilkporc
ID: 39155321
curl  writes to stderr!

AVGSPEED=$(curl -o /dev/null  http://download.thinkbroadband.com/1MB.zip 2>&1 | awk '{A=$7} END {print A}') 

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Author Comment

by:brothertom
ID: 39155388
This results in 0 value.
The reason is curl uses carriage return to display the stats.

So, the stderr output is actually


  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
^M  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0^M 12 1024k   12  127k    0     0   278k      0  0:00:03 --:--:--  0:00:03  343k^M 56 1024k   56  574k    0     0   392k      0  0:00:02  0:00:01  0:00:01  417k^M 99 1024k   99 1020k    0     0   414k      0  0:00:02  0:00:02 --:--:--  429k^M100 1024k  100 1024k    0     0   413k      0  0:00:02  0:00:02 --:--:--  428k

So the processing needs to strip all lines before ^M100 (i.e. 100%) and process the remainder.  That is the problem I'm having doing.

Thanks
BT
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LVL 68

Accepted Solution

by:
woolmilkporc earned 2000 total points
ID: 39155429
Ok, you're right. My test download was too small. Try this:

AVGSPEED=$(curl -o /dev/null  http://download.thinkbroadband.com/1MB.zip 2>&1 | awk 'BEGIN {RS="\r"}{A=$7} END {print A}')

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Author Closing Comment

by:brothertom
ID: 39155480
Perfect, thanks very much
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