Use CURL Command to download remote files in Shell scripting

Question

I need to download remote files using curl command below

curl -O -J "URL"

This is working as expected when I use this command separately when I try to use the same command in a shell script(below). it gives error below.

#!/bin/bash 
$curl -O -J "$url_final"
=======================================================
"curl: (3) URL using bad/illegal format or missing URL"

url_final is a variable which will download files. Curl is not a typo, it is working as a separate command in the terminal. — Deepan Chakravarthy
– Deepan Chakravarthy, Commented Feb 17, 2018 at 6:34
where $url_final is defined inside the script ? I am talking about the $ sign in front of curl inside the script, is that a typo ? — iamauser
– iamauser, Commented Feb 17, 2018 at 6:36

user9372600 · Accepted Answer · 2018-02-17 06:31:04Z

1

Using a valid url in my tests seemed to have no issues with this curl request. I also tried using with and without wrapping the url in a string like you are along with using brackets.

url="https://cdn.sstatic.net/Sites/stackoverflow/img/sprites.svg?v=1b3cdae197be"

# all work fine
curl -O -J $url 
curl -O -J "$url"
curl -O -J "{$url}"

My best answer is that your $url_final variable is undefined, empty, or malformed.

answered Feb 17, 2018 at 6:31

user9372600

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1 Comment

Deepan Chakravarthy Over a year ago

I feel the problem is the URL which I am generating. I have to revisit the URL again.

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