The most important part of Linux user interaction is the console. Met here with a wonderful script to check the speed of the Internet connection.
All you need is to go to the project page and perform a couple of simple operations, I did not use the most affordable many options.

curl -Lo speedtest-cli https://raw.githubusercontent.com/sivel/speedtest-cli/master/speedtest.py
chmod +x speedtest-cli

or

wget -O speedtest-cli https://raw.githubusercontent.com/sivel/speedtest-cli/master/speedtest.py
chmod +x speedtest-cli

With these commands we will download the script and allow its execution. Additional flags to run in the sequel.

Here is the very help, so as not to look for yourself then.

$ speedtest-cli -h
usage: speedtest-cli [-h] [--no-download] [--no-upload] [--single] [--bytes]
[--share] [--simple] [--csv]
[--csv-delimiter CSV_DELIMITER] [--csv-header] [--json]
[--list] [--server SERVER] [--exclude EXCLUDE]
[--mini MINI] [--source SOURCE] [--timeout TIMEOUT]
[--secure] [--no-pre-allocate] [--version]

Command line interface for testing internet bandwidth using speedtest.net.
--------------------------------------------------------------------------
https://github.com/sivel/speedtest-cli

optional arguments:
-h, --help show this help message and exit
--no-download Do not perform download test
--no-upload Do not perform upload test
--single Only use a single connection instead of multiple. This simulates a typical file transfer.
--bytes Display values in bytes instead of bits. Does not affect the image generated by --share, nor output from --json or --csv
--share Generate and provide a URL to the speedtest.net share results image, not displayed with --csv
--simple Suppress verbose output, only show basic information
--csv Suppress verbose output, only show basic information in CSV format. Speeds listed in bit/s and not affected by --bytes
--csv-delimiter CSV_DELIMITER Single character delimiter to use in CSV output. Default ","
--csv-header Print CSV headers
--json Suppress verbose output, only show basic information in JSON format. Speeds listed in bit/s and not affected by --bytes
--list Display a list of speedtest.net servers sorted by distance
--server SERVER Specify a server ID to test against. Can be supplied multiple times
--exclude EXCLUDE Exclude a server from selection. Can be supplied multiple times
--mini MINI URL of the Speedtest Mini server
--source SOURCE Source IP address to bind to
--timeout TIMEOUT HTTP timeout in seconds. Default 10
--secure Use HTTPS instead of HTTP when communicating with speedtest.net operated servers
--no-pre-allocate Do not pre allocate upload data. Pre allocation is enabled by default to improve upload performance. To support systems with insufficient memory,  se this option to avoid a MemoryError
--version Show the version number and exit