curl: PUT

Testing curl PUT commands.

Start by creating an HTTP PUT server:

and run with python


curl -XPUT -H "Content-Type: application/json" http://localhost:8000 -d '{"test": null}'

and now you can mess around creating arbitrary PUT commands.


  1. spaces don’t matter between -H and quotes.


is the same as:

-H "Content-Type

2. Double quotes == Single quotes. E.g.

-H'Content is OK

3. argument to -dmust be surrounded in quotes. E.g.

-d 'test=test' is OK.

-d test=test is NOT OK.

E.g. see examples here:


curl: tips – silent, using variables in bash


-s=> silent – so no Progress bar

-S=> don’t output errors

bash variables

Using a variable in a curl call within Bash – remember to double-escape quotes. E.g.

processing curl output

e.g. I wanted to count the lines from a GET for an Elasticsearch nodes. This seemed the obvious:

curl 0:9200/_cat/indices?v&health=yellow | wc -l

but there are a few things wrong here.

1. it outputted everything to the terminal including all the green nodes and then seemed to hang until I hit Enter – not what I was expecting


there’s an ampersand character in the URL.

2. also there’s progress output from curl


silence with -s

curl -s "0:9200/_cat/indices?v&health=yellow" | wc -l

3. you still get the header from elasticsearch. i.e.

health status index uuid pri rep docs.count docs.deleted store.size