Installing Curl on Debian

1. Open the terminal application
2. Update system, run: sudo apt update && sudo apt upgrade
3. Install curl on Debian, execute: sudo apt install curl
4. Test curl

Let us see how to install and use curl on Debian.

How to install curl on Debian Linux 10/9/8

Type the following command to install curl on Debian Linux:
$ sudo apt install curl
OR
$ sudo apt-get install curl
Sample outputs:

[sudo] password for vivek: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following additional packages will be installed:
  libcurl3
The following NEW packages will be installed:
  curl libcurl3
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 518 kB of archives.
After this operation, 989 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 http://mirrors.kernel.org/debian stretch/main amd64 libcurl3 amd64 7.52.1-5 [291 kB]
Get:2 http://mirrors.kernel.org/debian stretch/main amd64 curl amd64 7.52.1-5 [227 kB]
Fetched 518 kB in 4s (116 kB/s)
Selecting previously unselected package libcurl3:amd64.
(Reading database ... 240584 files and directories currently installed.)
Preparing to unpack .../libcurl3_7.52.1-5_amd64.deb ...
Unpacking libcurl3:amd64 (7.52.1-5) ...
Selecting previously unselected package curl.
Preparing to unpack .../curl_7.52.1-5_amd64.deb ...
Unpacking curl (7.52.1-5) ...
Setting up libcurl3:amd64 (7.52.1-5) ...
Processing triggers for libc-bin (2.24-11+deb9u1) ...
Processing triggers for man-db (2.7.6.1-2) ...
Setting up curl (7.52.1-5) ...

Usage

Once installed you can use it as follows to see the headers:
$ curl -I https://www.google.co.in/
$ curl -I https://www.cyberciti.biz/
Sample outputs:

HTTP/2 200 
server: nginx
date: Tue, 03 Oct 2017 05:24:03 GMT
content-type: text/html;charset=utf-8
vary: Accept-Encoding
cache-control: public,max-age=14400,s-maxage=14400,must-revalidate
expires: Tue, 03 Oct 2017 09:14:57 GMT
etag: d01116f2eda45a43e65b0242ed052e73
last-modified: Sat, 23 Sep 2017 17:37:16 GMT
strict-transport-security: max-age=15768000
x-content-type-options: nosniff
x-frame-options: SAMEORIGIN
x-xss-protection: 1
x-whome: l-cbz01

Or download a file from a server using curl itself:
curl -o output.file http://server1.cyberciti.biz/foo.bar.txt
You can resume broken download with the curl command as follows:
curl -L -O -C - http://ftp.ussg.iu.edu/linux/centos/latest/isos/file.iso

Getting more help on curl

Type the following man command:
man curl
OR
curl --help
See also:

• How to use the cURL command to do a POST data to fields on Linux or Unix