[MacTUG] Using curl for telnet testing on macOS High Sierra and later | Der Flounder

[Marlon Griffith]

"""
As part of introducing macOS High Sierra, Apple removed the telnet tool 
from macOS. This was part of Apple’s overall effort to improve security, 
as telnet does not use encryption and its traffic can be intercepted and 
read. However, telnet did (and does) serve a useful function as a quick 
way to check if it is possible to connect to a remote server on a 
particular port.

While there are alternative tools available for this task (like netcat), 
it’s also possible to still create a telnet connection on macOS using 
another tool: curl

https://derflounder.wordpress.com/2021/05/23/using-curl-for-telnet-testing-on-macos-high-sierra-and-later/
"""