Installing CURL on Ubuntu 18.04

The procedure to install cURL on Ubuntu Linux is as follows:
  1. Update your Ubuntu box, run: sudo apt update && sudo apt upgrade
  2. Next, install cURL, execute: sudo apt install curl
  3. Verify install of curl on Ubuntu by running: curl --version
Let us see all commands in details.

Ubuntu install curl command

First update the system and get latest stable curl version for Ubuntu:
$ sudo apt update
$ sudo apt upgrade
Type the following apt command or apt-get command:
$ sudo apt install curl
Sample outputs:
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following additional packages will be installed:
  libcurl4
The following NEW packages will be installed:
  curl libcurl4
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 373 kB of archives.
After this operation, 1,036 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 http://in.archive.ubuntu.com/ubuntu bionic-updates/main amd64 libcurl4 amd64 7.58.0-2ubuntu3.7 [214 kB]
Get:2 http://in.archive.ubuntu.com/ubuntu bionic-updates/main amd64 curl amd64 7.58.0-2ubuntu3.7 [159 kB]
Fetched 373 kB in 2s (150 kB/s)
Selecting previously unselected package libcurl4:amd64.
(Reading database ... 164985 files and directories currently installed.)
Preparing to unpack .../libcurl4_7.58.0-2ubuntu3.7_amd64.deb ...
Unpacking libcurl4:amd64 (7.58.0-2ubuntu3.7) ...
Selecting previously unselected package curl.
Preparing to unpack .../curl_7.58.0-2ubuntu3.7_amd64.deb ...
Unpacking curl (7.58.0-2ubuntu3.7) ...
Setting up libcurl4:amd64 (7.58.0-2ubuntu3.7) ...
Processing triggers for libc-bin (2.27-3ubuntu1) ...
Processing triggers for man-db (2.8.3-2ubuntu0.1) ...
Setting up curl (7.58.0-2ubuntu3.7) ...

Verification

Run the following command:
$ curl --version
Ubuntu install curl command and verify it

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 
date: Mon, 29 Jul 2019 13:13:08 GMT
content-type: text/html; charset=UTF-8
set-cookie: __cfduid=d5292058141c28e3cda2d9501688cff531564405988; expires=Tue, 28-Jul-20 13:13:08 GMT; path=/; domain=.cyberciti.biz; HttpOnly; Secure
vary: Accept-Encoding
strict-transport-security: max-age=15552000
x-whome: l-cbz02
cf-cache-status: HIT
age: 102433
x-content-type-options: nosniff
expect-ct: max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
server: cloudflare
cf-ray: 4fdf59334ab9dcb5-MAA
Or download a file from a server using curl itself:
curl -o output.file http://server1.cyberciti.biz/bar.foo.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