This should have been easy but for some reason it's not:
Trying to run a simple curl command, get it's output, and do stuff with it.
cmd='curl -v -H "A: B" http://stackoverflow.com'
result=`$cmd | grep "A:"`
...
The problem - the header "A: B" is not sent.
The execution of the curl command seems to ignore the header argument, and run curl twice - second time with "B" as host (which obviously fail).
Any idea?
Your problem here is that all you are doing on the first command is just setting cmd to equal a string.
Try using $(...) to execute the actual command like so:
cmd=$(curl -v -H "A: B" http://stackoverflow.com)
The result of this will be the actual output from with curl request.
This has been answered many-times see here for example Set variable to result of terminal command (Bash)
Keep in mind that cURL debug output is redirected to STDERR - this is so you can pipe the output to another program without the information clobbering the input of the pipe.
Redirect STDERR to STDOUT with the --stderr - flag like so:
cmd="curl -s -v http://stackoverflow.com -H 'Test:1234' --stderr -"
result=`$cmd | grep "Test:"`
echo $result
./stackoverflow.sh
> 'Test:1234'
