Assign curl http reponse code to variable

Question

I've got the following call in a bash script I'm creating

response= curl -X POST $URL -u "$USER:$PASSWORD" --data-urlencode "key=$key" --data "label=pub_key" -o /dev/null --silent --write-out "%{http_code}"

I can see 200 being written to the console however $response always ends up null.

I've also tried the following but it was not better.

response= $(curl -X POST $URL -u "$USER:$PASSWORD" --data-urlencode "key=$key" --data "label=pub_key" -o /dev/null --silent --write-out "%{http_code}")

Any help for a bash noob would be appreciated.

Jens · Accepted Answer · 2015-12-09 10:14:59Z

4

Space -- the final frontier:

response=$(curl -X ...)

Note: no spaces around the =. The shell is white-space sensitive in a few places and variable assignments are one of them.

With the space, as in var= command args, you set var as empty in a one-shot assignment and then run command.

answered Dec 9, 2015 at 10:14

Jens

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2 Comments

Airomega Over a year ago

Spot on! It seems I have some reading to do on variable assignment syntax. Thanks :)

chepner Over a year ago

It's more accurate to say the shell is extremely whitespace sensitive. It's not that response= foo is some sort of syntax error compared to response=foo; each is a completely valid syntax for two completely different operations. (The first calls the command foo with the variable response set to an empty string in its environment; the second is a variable assignment.)

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