mjhjmtu

(CentOS 7)

When I try a curl command like curl -u elastic -X GET 'http://localhost:9200/*' | more, I find that after typing only a single letter, the command executes as if I have pressed enter, and fails to authenticate.

Is this normal?

I can redirect to a file, or just scroll up, maybe even use wget (haven't tried), or even put my password in the command, but I would like to know what's going on here.

The problem is that curl and more are both reading from the same TTY at the same time. Moreover they are probably both changing the TTY settings; curl because the password you type shouldn't be shown on the screen. And more because it needs character based input rather than the default line based input.

To prevent that from happening I think you just need to delay starting the more command until the curl command has started producing output. I don't know of a standard command to do that, but it can be done with two lines of Python code.

#!/usr/bin/python
import select
select.select([0], , )

With the above Python script you can then try this variation of the original command:

curl -u elastic -X GET 'http://localhost:9200/*' | ( ./wait.py ; more )

per

# curl --help | grep -- ' -u'
 -u, --user USER[:PASSWORD] Server user and password
# 

try:

curl --silent --user elastic:changeme --request GET localhost:9200/*?pretty | more

yet another solution:

# pass=changeme
# curl -I -u alexus:$pass https://X.X.X
HTTP/1.1 200 OK
Server: nginx/1.13.5
Date: Wed, 27 Sep 2017 17:27:19 GMT
Content-Type: text/html; charset=utf-8
Content-Length: 2350
Connection: keep-alive
Accept-Ranges: bytes
Cache-Control: max-age=31536000
Last-Modified: Sun, 13 Aug 2017 18:21:51 GMT
Strict-Transport-Security: max-age=15768000

# 

one can also store pass variable inside of a file (don't forget to chmod 700 that file) and use source to read variable before running curl.

voila!