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In this command:

curl -d param1=value1 -d param2=value2 http://example.com/submit

If value1 is located in file1.txt, how can I make cURL include file1.txt in the command?

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up vote 3 down vote accepted

Something like this should do the trick: curl -d param="$(cat file1.txt)" ...

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2  
You can also do $(< file1.txt) and avoid using cat. – Reid Jul 25 '11 at 16:02
    
Right. I just love cats :) – alex Jul 25 '11 at 18:02
1  
You can do '--data-urlencode' option with 'param@file1.txt' semantic :). – Grzegorz Wierzowiecki Sep 19 '11 at 22:17

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