cURL call works with number but not with variable containing number

Question

I've ran into a strange issue. I'm trying to script my router to collect usage stats and other stuff. I'm making one cURL to the auth URL to get a valid session id, then another using that session id to the page I need.

Here is my script:

SESSION_ID=$(curl --silent -D - -X POST http://10.0.0.1/login.cgi -d'admin_username=admin&admin_password=admin' | grep 'SESSION' | sed 's/Set-Cookie: SESSION=//' | sed 's/; path=\///')
echo $SESSION_ID # 1234567890
curl -v -H "Cookie: SESSION=$SESSION_ID" http://10.0.0.1/modemstatus_dslstatus.html

If I manually take SESSION_ID and insert it in place of '"$SESSION_ID"' everything is dandy. cURL shows the headers (via -v) and they are correct. Running the command while manually inserting the session id produces identical headers.

I'm sure it's something small. Please teach me something :)

You seem to have nested single-quotes in ` ' Cookie: SESSION= ' " $SESSION_ID" ' ' ` (extra spaces added for clarity) that certainly dont do what you want. (Posted at same time as @heemayl. We're basically saying the same thing.) — Mort
– Mort, Commented Dec 19, 2016 at 3:26
@Mort Updated to reflect heemayl's suggestion, which eliminates those nested quotes. — brian
– brian, Commented Dec 19, 2016 at 3:28
Try set -x and then run the curl command. Also, what does printf '%q\n' "$SESSION_ID" report? — muru
– muru, Commented Dec 19, 2016 at 3:29

brian · Accepted Answer · 2016-12-19 06:03:36Z

1

Check for carriage returns \r in your variables which wouldn't appear with a simple echo in some cases.

edited Dec 19, 2016 at 6:03

answered Dec 19, 2016 at 3:33

brian

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