Execute multiple curl cmds with sleep and send output to file

Larry Groves
Larry Groves used Ask the Experts™
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First off, I am, in no way a Unix/Linux expert, so please bear with me. Also, I sure hope I've selected the proper topics for this question...

I need to run a few thousand curl cmds but I'm having difficulties figuring out how to go about doing this.

1. The curl is an XPOST (e.g. JSON)
For example:
curl -XPOST -H 'name1: value1' -H 'name2: value2' -H "Content-type: application/json" -d '{ "name3": [{"blah1": "blah1","aaa1": "blah2"}]}' 'http://domain.com'
curl -XPOST -H 'name1: value1' -H 'name2: value2' -H "Content-type: application/json" -d '{ "name3": [{"blah2": "blah2","aaa2": "blah2"}]}' 'http://domain.com'
curl -XPOST -H 'name1: value1' -H 'name2: value2' -H "Content-type: application/json" -d '{ "name3": [{"blah3": "blah3","aaa3": "blah2"}]}' 'http://domain.com'

The thing is I need to run this in a script so that there is a delay between each one. Also, once 1 curl is run, I get back a result which I'd like to save.

I thought I could just load all of the curl cmds in a text file and run something like:

while read line; do $line; sleep 5; done < input_curl.txt >> output_curl.txt

The resulting curl response would be something like:
{"name2":"value2","resultname1":resultvalue1,"resultvalue2":"resultname2","resultname3": etc etc...

My thought was that I'd be able to run each curl, line by line, then have it sleep for 5 seconds, and then run the next one. And, the curl result would be writen to output_curl.txt. Of course, that doesn't work.

Any help would be greatly appreciated.

Thanks,
Larry
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Top Expert 2007

Commented:
where the curl lines will be taken from?

Author

Commented:
Hi omarfarid,

As I wrote, there are thousands of them, so I thought it would be best to get all of the curls into a file, 1 line for each, and execute that file from the cmd line. I'm not saying that's the correct way going about doing this though.

Thanks,
Larry
Top Expert 2007

Commented:
the while loop should work

while read line
do
sh $line
sleep 5
done < input_curl.txt >> output_curl.txt

but why you want to send all output to one file?
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Author

Commented:
Not sure about the "sh". The input file is a text file. The reason why I need the curl response writen to a file is because I need to make sure there are no errors being returned. And, since I'm not running these curl cmds one at a time, I'd never see the results unless it's written to a file. That's why I used >> so that each curl response would get appended.
Top Expert 2007

Commented:
what is your question for sh ?

Author

Commented:
When I run that with the sh I get:

-bash-4.1$ while read line; do sh $line; sleep 5; done < input_curl.txt >> output_curl.txt
/usr/bin/curl: /usr/bin/curl: cannot execute binary file
Top Expert 2007
Commented:
sorry, you may remove sh

the while loop should do what you want, but if you want to capture errors the you need to redirect stderr as well:

while read line
do
$line
sleep 5
done < input_curl.txt >> output_curl.txt 2>&1

Author

Commented:
That did it! Thank you so much omarfarid!

Author

Commented:
Thank you!
Top Expert 2007

Commented:
Welcome :)

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